Thousands of civilians are trapped in the rubble of the Old City in Syria as government forces withdraw from the besieged city, the UN human rights office said.

The United Nations said in a statement on Saturday that more than 1,400 people have been killed in the five-year conflict between Syrian President Bashar al-Assad’s forces and rebels.

The office said more than 11,000 people have died in fighting in Syria since the conflict began in March 2011.

The U.N. refugee agency UNHCR has warned that the country’s three-year-old conflict is “going to be a bloodbath”, adding that “many of the people who are suffering from hunger are children.”

In a separate statement, Amnesty International said the Syrian government was trying to “retaliate against all those who have not been killed” and to “make the conflict more brutal and brutal” in the country.

“The Syrian regime and its allies are systematically murdering civilians with a vengeance,” Amnesty International’s deputy Middle East director David Kaye said.

“The regime is using all means it can to intimidate and frighten those who speak out against the regime, and to silence those who are critical of the regime.”

The war has killed more than 110,000 Syrians and displaced more than three million others.