BEIRUT: Security forces killed 37 people in Syria Friday, activists and residents said, as people in Homs mourned 14 members of a family they said were slain by militiamen in one of the worst sectarian attacks in a revolt against President Bashar al-Assad.

Much of the violence was focused in Homs, where heavy gunfire hammered the city in a second day of chaos.

In the past two days more than 74 people have been killed in an enduring bloody crackdown.

In an attempt to stop the bloodshed in the country, the U.N. Security Council was to hold a closed-door meeting Friday to discuss the crisis, a step toward a possible resolution against the Damascus regime, diplomats said.

Homs saw a flare-up of sectarian kidnappings and killings starting Thursday between its Sunni and Alawite communities, and pro-regime forces blasted residential buildings with mortars and gunfire, according to activists who said an entire family was killed.

A video posted online by activists showed the bodies of five small children, five women of varying ages and a man, all bloodied and piled on beds in what appeared to be an apartment after a building was hit in the Karm al-Zaytoun neighborhood of the city. A narrator said an entire family had been “slaughtered.” The video could not be independently verified.

Activists said at least 30 people had been killed in Homs Thursday.

As of Jan. 7, at least 384 children have died in the crackdown on Syria’s uprising since it began nearly 11 months ago, the U.N. children’s agency UNICEF said Friday, according to a count based on reports from human rights groups. Most of the children killed were boys and most of the deaths took place in Homs, UNICEF said. The United Nations estimates that more than 5,400 people have died in the turmoil.

The Syrian uprising, which began in March with mostly peaceful demonstrations, has become increasingly violent in recent months as army defectors clash with government forces and some protesters take up arms to protect themselves. The violence has enflamed the potentially explosive sectarian divide in the country, where the Alawite minority dominates the regime despite a Sunni Muslim majority.

The head of Arab League observers in Syria said in a statement that violence in the country has spiked over the past few days. Sudanese Gen. Mohammad Ahmad al-Dabi said the cities of Homs, Hama and Idlib have all witnessed a “very high escalation” in violence since Tuesday.

Early Friday morning, Assad’s forces launched a “fierce military campaign” in the Hamadiyeh district of Hama, according to the British-based Syrian Observatory for Human Rights and other activists. They said the sound of heavy machine-gun fire and loud explosions reverberated across the area.

Some activists reported seeing uncollected bodies in the streets of Hama.

Elsewhere, a car bomb exploded Friday at a checkpoint outside the northern city of Idlib, the Observatory said, citing witnesses on the ground. The number of casualties was not immediately clear.

In the Egyptian capital Cairo, around 200 opposition Syrians protested outside the Syrian Embassy, throwing stones at the building and jostling with police and soldiers. Several dozen broke into the building’s lobby, smashing a picture of Assad and some windows before being hustled out.

In Homs, Thursday started with a spate of sectarian kidnappings and killings between the city’s population of Sunnis and Alawites, a Shiite sect to which Assad belongs as well as most of his security and military leadership, said Mohammad Saleh, a centrist opposition figure and resident of Homs.

The violence culminated with the evening killing of the family, Saleh said, adding that the full details of what happened were not yet clear.

“It’s racial cleansing,” said one Sunni resident of Karm el-Zaytoun, speaking on condition of anonymity for fear of reprisal. “They are killing people because of their sect,” he said.

Thursday’s death toll in Homs was at least 35, said the Observatory and the Local Coordination Committees, an umbrella group of activists. Both groups cite a network of activists on the ground in Syria for their death tolls. The reports could not be independently confirmed.

Also Friday, Iran’s official IRNA news agency said gunmen in Syria have kidnapped 11 Iranian pilgrims traveling by road from Turkey to Damascus.

Iranian pilgrims routinely visit Syria – Iran’s closest ally in the Arab world – to pay homage to Shiite holy shrines. Last month, seven Iranian engineers building a power plant in central Syria were kidnapped. They have not yet been released.

The Free Syrian Army – a group of army defectors – released a video on its Facebook page claiming responsibility for the kidnapping and saying the Iranians were taking part in the suppression of the Syrian people. The leader of the group could not be reached for comment.

Bassma Kodmani, a spokeswoman for the opposition Syrian National Council, said the group is working to help the army defectors to link them up and supply them with everything from communications equipment to clothes. Speaking in Paris, she said defectors are increasingly swelling the ranks of the Free Syrian Army and it is becoming a critical force in the uprising.

Assad’s regime claims terrorists acting out a foreign conspiracy, rather than protesters seeking change, are behind the uprising and that thousands of security forces have been killed. International pressure on Damascus to end the bloodshed has so far produced few results.

The Arab League has sent observers to the country, but the mission has been widely criticized for failing to stop the violence. Gulf states led by Saudi Arabia pulled out of the mission Tuesday, asking the Security Council to intervene because the Syrian government has not halted its crackdown.

Saudi Arabia may also recognize the Syrian National Council as the “official representative” of the Syrian people, a senior member of the opposition group said in remarks published Friday.

The U.N. Security Council has been unable to agree on a resolution since the violence began because of strong opposition from Russia and China.