Two "terrorists" were killed as a booby-trapped car they were driving blew up in a Palestinian refugee camp in a suburb of Damascus, Syria's state news agency SANA reported on Sunday.

It said the blast in Yarmouk camp on Saturday, the same day as authorities said 27 people were killed in two suspected car bombings in central Damascus, also damaged parked cars and shattered windows of nearby buildings.

Prime Minister Najib Miqati stressed that the government will not collapse despite the internal disputes, especially those regarding the appointments of civil servants, reported the daily An Nahar on Sunday.

He told the daily: “It’s in no one’s interest to topple the government at the time being.”

Iran, Syria's regional ally, on Saturday condemned deadly bomb blasts that rocked Damascus and blamed them on unnamed countries supplying arms to Syrian rebels, the official IRNA news agency reported.

"The responsibility of such actions lies with those whose agenda is to arm and provoke armed groups," foreign ministry spokesman Ramin Mehmanparast said in a statement.

Thousands of protesters gathered outside the White House Saturday to demand that the United States "stop the massacre in Syria," where an estimated 8,000 people have been killed in a regime crackdown.

Wearing T-shirts declaring "I have a dream of a free Syria" and "No longer afraid," the demonstrators -- who numbered 4,000, according to organizers -- were marking the first anniversary of a bloody revolt against President Bashar Assad's regime.

Bulgaria on Saturday urged all its nationals to "immediately" leave Syria due to the worsening security situation in the violence-wracked country after a year of unrest.

"The foreign ministry calls on all Bulgarian citizens in Syria to immediately leave the country," the foreign ministry said.

Iraq's deputy foreign minister voiced support on Saturday for the idea of peacekeeping forces manned exclusively by Arab League troops but stopped short of backing a Qatari proposal to deploy one in Syria.

Labid Abbawi's remarks come ahead of an Arab summit due in Baghdad on March 29, the first meeting of the 22-nation bloc in the Iraqi capital since the late dictator Saddam Hussein's 1990 invasion of Kuwait.

Five Syrian opposition groups on Saturday announced the formation of a new coalition, a sign of how difficult opponents of the Damascus regime find it to cooperate, a year after the start of the protest movement.

The five groups, meeting here, said their yet unnamed coalition would act independently from the Syrian National Council (SNC), the main opposition coalition which was set up in August to fight President Bashar Assad's regime.

Hundreds of Lebanese and Syrian supporters of Syrian President Bashar Assad held a sit-in in downtown Beirut on Saturday as a rival rally for anti-Assad protestors was held against violence in the neighboring country, according to the National News Agency.

Activists, intellectuals, and independent Syrian and Lebanese people rallied at the Martyrs Square in downtown Beirut in support of the “Syrian revolution.”

A spiritual Christian-Islamic summit will be held at Bkirki on March 25 in the presence of the head of the Sunni, Shiite, Maronite and Druze spiritual leaders, along with the members of the Christian-Muslim Committee for Dialogue, the Central News Agency reported on Saturday.

“The past few days witnessed intensified contacts to stress the importance of holding a spiritual summit on March 25, which was agreed upon during the last summit at Dar al-Fatwa (in September),” sources from the Christian-Islamic Committee for Dialogue told the news agency.

A U.N. team mandated by international envoy Kofi Annan will leave for Damascus on Monday, the former U.N. secretary general's spokesman said.