Violence killed at least 69 people, including 38 civilians, in Syria on Thursday after one of the bloodiest days of the 15-month revolt left nearly 150 dead, a human rights watchdog said.

Two bombs exploded outside the Palace of Justice in central Damascus on Thursday, state television reported.

The opposition Syrian National Council said on Thursday that it will not join any interim government until President Bashar Assad quits after diplomats said peace envoy Kofi Annan was pushing the idea.

"The opposition has not yet received the details of the Annan proposal and cannot reply to it," SNC spokesman George Sabra told Agence France Presse by telephone.

Russia said Thursday it backed a political transition in Syria but rejected Western pressure to call for the exit of President Bashar Assad, ahead of international talks on ending the spiraling conflict.

Foreign Minister Sergei Lavrov poured cold water on hopes that world powers have already agreed a common strategy ahead of the weekend talks in Geneva, saying Moscow was opposed to any solution imposed from abroad.

Turkey is sending missile batteries and army vehicles to the border with Syria as a "security corridor,” almost a week after the Syrian downing of a Turkish military jet, media reports said Thursday.

There was no official confirmation of the reported military moves.

Violence killed at least seven people in Syria on Thursday morning after one of the bloodiest days of the 15-month revolt left nearly 150 dead, a human rights watchdog said.

Four people were killed in the Damascus suburb of Douma when troops surrounded the town, meeting fierce resistance from rebel fighters, the Syrian Observatory for Human Rights said.

International envoy Kofi Annan has proposed setting up a Syrian transitional authority that could include followers of President Bashar Assad and opposition members in a bid to end the country's war, diplomats said Wednesday.

Russia and the other major powers -- the United States, Britain, France and China -- back the plan, which will be discussed at a meeting of foreign ministers Annan has convened in Geneva on Saturday, they said.

A Hamas member was killed Wednesday in a suburb of the Syrian capital Damascus, a senior member of the group told Agence France Presse, adding that they suspected Israel's spy agency of being behind the attack.

The victim was Kamal Hussein Ghannaje, said the official, speaking under condition of anonymity.

An attack on a pro-government television near Damascus killed seven staff Wednesday, state media said, while 29 people died in other violence on the heels of the "bloodiest week" of the 15-month uprising, according to a watchdog.

Live footage broadcast by state television showed extensive damage to the studios of Al-Ikhbariya satellite channel outside the capital with several small fires still burning.

The United States on Wednesday condemned an attack on a pro-government television station in Syria which killed seven staff in the latest bloody twist of an uprising against the Damascus regime.

"We condemn all acts of violence including those targeting pro-regime elements," White House spokesman Jay Carney said, and also rebuked President Bashar al-Assad for unnecessarily killing civilians with a brutal crackdown.

The U.N. Security Council on Wednesday expressed concern that the Syria conflict could jeopardize the safety of U.N. monitors in the Golan Heights between Israel and Syria.

A 1,200 strong unarmed force, which has been in the heights since 1974, has come under fire this year from the Syrian side of the border.