BEIRUT — Syrian security forces opened fire on anti-government protests after prayers today at several locations around the country while the army sent reinforcements into the tense south where military defectors have recently launched deadly attacks on regime troops.

The Local Coordination Committees and the British-based Syrian Observatory for Human Rights said one person was killed in the shooting in the city of Homs, and a man who was wounded in Daraa earlier in the day died his wounds.

The Observatory said more than 200,000 people marched in different neighborhoods of Homs, denouncing President Bashar Assad’s regime. The turnout could not be confirmed as Syrian authorities have banned most journalists from covering events on the ground.

The Observatory also reported shooting near a mosque in the eastern city of Deir el-Zour but it was unclear if there were casualties there.

The LCC said anti-government rallies took place after prayers all across Syria — from Daraa to the suburbs of the capital Damascus, in Homs and Hama in the country’s center, and to the north, in the city of Aleppo.

The protests came a day after Syrian army defectors killed 27 government forces in Daraa in apparently coordinated attacks that were among the deadliest by rebel troops so far.

Syria has seen a sharp escalation in armed clashes recently, raising concerns the country of 22 million is headed toward civil war. The U.N. raised its death toll for the Syrian uprising substantially this week, saying more 5,000 people have been killed since the revolt began.

The LCC said troops deployed in different areas in Daraa today, and that electricity was cut in several locations.

Because of the turmoil, Canadian Foreign Affairs Minister John Baird said Thursday Canadians living in Syria should leave as soon as possible while commercial flights are still available. Washington issued a similar warning for in September.