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Cairo (CNN) -- Egypt's military-led government Tuesday denied using violence against protesters and said the resignation of the country's Cabinet has been accepted, although members will remain until a new government is formed.

"We never fired one bullet against any Egyptian," said Supreme Council of the Armed Forces Field Marshal Mohamed Hussein Tantawi in a speech. "Our first goal from the start of the transitional phase was to restore security in the streets."

Tantawi spoke on the fourth straight day of protests and clashes in Cairo and beyond, in which 30 people have died, and about 1,950 have been injured, the Health Ministry said.

Egypt's Interior Ministry said Monday that 102 officers and conscripts have been injured, with wounds ranging from gunshots to burns from Molotov cocktails. One officer was shot in the head.

The nation's Cabinet offered to resign Monday, with one minister citing concern over the violence in Cairo's Tahrir Square. Tantawi said that resignation is accepted, but the current government will remain as a caretaker government until a new prime minister is named to form a new government.

The Supreme Council of the Armed Forces began leading the country after protesters ousted former President Hosni Mubarak in February. Tantawi did not announce any changes to the Supreme Council's role.

He emphasized that the Supreme Council is committed to a transition to a civilian authority, and said elections will be held on time. Parliamentary elections are scheduled for Monday, and presidential elections are to be held by June.

"We never made a political decision unilaterally and we always consulted the political parties," Tantawi said. "... The criticism that we receive targets the integrity of the armed forces."

Earlier Tuesday, Egypt's prime minister appealed for calm and asked protesters to return to their homes.

"We have met the demands of the people and submitted our resignations," Prime Minister Essam Sharaf said, according to Egypt's Nile TV. "Now please put the interests of the country first."

Sharaf spoke after fresh violence broke out Tuesday near Tahrir Square. His plea, however, did little to calm the clashes.

Protesters hurled stones at police and chanted, calling for the downfall of the Supreme Council.

Demonstrators apparently tried to defend Tahrir Square as they faced off with police on a connecting street. The square was once a hub for the movement that led to Mubarak's ouster and is now a center for the protests against Egypt's military rulers.

Walking through Tahrir Square

Egypt's Cabinet submits resignation

Clashes continue in Tahrir Square

Egypt's economy grinds to a halt

Egyptian police responded with tear gas and rubber bullets, forcing protesters to retreat briefly before they returned with renewed intensity. Violence also spread to other parts of Egypt.

After Mubarak's fall, military leaders took control with the promise that eventually a civilian government would be elected and take over.

Military leaders still say they will hand over power to a new government when one is elected. However, while parliamentary elections are set to take place Monday, a complex electoral process follows.

Demonstrators say they are concerned the military, which would continue to be Egypt's top authority until a president is in place, wants to keep a grip on the country. Many also have voiced anger about a proposed constitutional principle that would shield the military's budget from scrutiny by civilian powers. They say they worry the military would become a state within a state.

On the streets of Cairo, some protesters have gone further, shouting that they believe Mubarak is running the military council and, in fact, the entire country from prison. He and his sons Gamal and Alaa face charges of corruption and of killing protesters.

Tantawi reiterated Tuesday that parliamentary elections would be held on time and that presidential elections would be held before June. "It is up to the Egyptian people to decide who will run the affairs of the country," he said.

Running the country, he noted, has not been an easy task, as Egypt's economy is ailing. Every time a step is taken toward stability, he said, "one incident takes place and it drags us backward."

Three Americans were arrested Monday outside the Interior Ministry in Cairo. Authorities accuse them of throwing Molotov cocktails, said Adel Saeed, a spokesman for the office of Egypt's general prosecutor.

The young men are students at American University in Cairo, according to university spokeswoman Morgan Roth. She identified them as Gregory Porter, 19, of Glenside, Pennsylvania; Luke Gates, 21, of Bloomington, Indiana; and Derrik Sweeney, 19, from Jefferson City, Missouri.

Porter attends Drexel University in Pennsylvania, Gates goes to Indiana University and Sweeney studies at Georgetown University, she said. At least two of them were on a semester-long study abroad program in Cairo.

David Lynfield, deputy press officer in the U.S. Embassy in Cairo, said the "claims are being currently investigated." The university is working with the embassy, Roth said.

Tuesday's violence marks the fourth day of clashes between security forces and protesters.

Some political factions vowed to hold a sit-in Tuesday at Tahrir Square, demanding the immediate resignation of the Supreme Council. They also demand the immediate punishment of those who have killed protesters in the past few days.

The Alliance of the Revolutionaries of Egypt is calling the event a "million man sit-in."

The Muslim Brotherhood, one of the largest organizations in the nation, has said that its members will not join that protest.

A group calling itself "the Political and Revolutionary Powers," including political parties, groups and coalitions, issued a statement asking the government to accept the Cabinet resignation and calling on the Supreme Council to return to its original mission of protecting Egypt's borders and managing its armed forces.

The group also called for an investigation into the deaths and injuries of protesters and for presidential elections to be held no later than May 2012.

Also, the organization said, authorities should "announce and execute a security plan to end the chaos and thuggery without destroying the pride of the citizens while cleansing the Ministry of Interior" of corruption, and ending military tribunals and emergency law. Those tried and convicted in military courts should be re-tried in a civil court, the group said.

"We didn't start this mess," said engineering student Mahmour Radwan, who traveled to Cairo from Alexandria on Tuesday with two friends to join the protests. He said authorities started it, when they killed people "and put them in the street."

Radwan and many other protesters were equipped with surgical masks and other items in an attempt to protect themselves from the clouds of tear gas. Young women stood nearby, holding bottles of water and poised to treat those overcome by the tear gas.

Violence also spread to Alexandria ahead of a planned "million man" protest there. One person was killed and 60 others injured in that city, said al-Adawi, a Health Ministry spokesman. Thousands of people clashed with police Monday night near the city's police headquarters. Rocks were thrown and tear gas used, said activist Huda Al-Sadani. Some people were arrested, Al-Sadani said, and clashes continued throughout the night.

Two of the deaths came in the city of Ismalia, said Sheeha, another Health Ministry spokesman. Violence also was reported in the city of Suez.

Amid the unrest, Egypt's Cabinet offered to resign Monday night.

As the potential political shuffling played out, animosity and violence continued to simmer in the streets.

Saeed, the spokesman for the general prosecutor's office, said 127 demonstrators who had been arrested in Cairo since Saturday have been released. Another five have been "detained temporarily for further investigation."

The military council said on its Facebook page it is "extremely sorry for what the events have led to." And spokesman Maj. Mohamed Askar said late Monday that the Supreme Council has ordered a fact-finding mission to assess what has happened.

Moreover, the Supreme Council also is calling upon "all political forces to hold dialogue as soon as possible in order to address the escalation" of unrest, Askar said.

However, Amnesty International, in a report issued this month, said the Supreme Council, "in the name of ensuring security and stability ... (has) committed numerous human rights violations, ignoring the very demands for social justice and fundamental freedoms that triggered the uprising."

"... Since assuming power in February, the Supreme Council of the Armed Forces has repeatedly pledged to break the cycle of repression entrenched over the past 30 years. In reality, however, it has resorted to familiar patterns of abuse."

A recent endorsement in full of Egypt's emergency law and its expansion, after it was restricted last year under Mubarak, is considered the largest example of human rights violation, the organization said. However, it alleged demonstrations have been violently dispersed and protesters have been arrested, detained and tortured "before being tried unfairly before military courts and convicted."

In addition, Amnesty International alleged, the Supreme Council has placed arbitrary restrictions on the media. Some television stations have been raided and ordered closed, while satellite television stations have been frozen. The council has also failed to address discrimination of women, according to the group.

"If the hopes of the uprising are to be realized, urgent action is needed now to ensure that one repressive rule is not simply replaced with another," the report said.