( CNN ) -- An array of explosives , from shells to barrel bombs , fell on Syrian cities in another day of bloodshed Thursday , according to activists fighting to overthrow President Bashar al-Assad . The Local Coordination Committees accused the government of using `` vacuum bombs . '' Also known as thermobaric explosives , they are effective at spreading destruction through urban areas , according to military experts . The LCC also repeated claims that the government used cluster bombs . U.S. identifying 'primarily political ' leaders for possible role in Syria oppositon . Damascus has not commented on the accusations . CNN can not independently confirm the claims because the Syrian government has limited access to international journalists . At least 149 people died Thursday , according to the LCC , 53 of them in Damascus and its suburbs . The reports follow a week of grim tolls , including 121 reported dead Wednesday and 163 on Tuesday . More than 32,000 people have died in the 19-month-old Syrian conflict , according to the Center for Documentation of Violations in Syria , an opposition group that tracks fatalities . International diplomacy appeared to remain stagnant Thursday as Russian Foreign Minister Sergey Lavrov repeated Moscow 's complaint that Syria 's oppositional factions offer no centralized leadership to negotiate with . `` There is no person who could speak on behalf of the Syrian opposition , and there will be no progress without negotiation , '' Lavrov said , according to the state-run Itar-Tass news agency . The U.N. and Arab League envoy for Syria , Lakhdar Brahimi , attempted a cease-fire this week , but it never took hold . Young Syrian amputee makes dangerous journey to find help . Opposition groups reported the sound of shells and explosive barrels thundering across Damascus on Thursday . In the suburbs , gunfire mixed with shelling as the opposition Free Syrian Army battled government forces , according to the LCC . The group also reported explosions and shelling in Daraa , Deir Ezzor and Idlib , where it said cluster bombs were used . Helicopters dropped more than eight barrel bombs on villages in Lattakia , the LCC said . Reports by a second opposition group , the Syrian Observatory for Human Rights , corroborated shelling in and around Damascus and in Idlib . The group said more than 30 members of regime forces had been killed in clashes with rebel fighters . The LCC said most of the 19 people killed in Hama on Thursday were kidnapped from the Kazo neighborhood and executed by Shabiha , gangs loyal to the regime . Syria 's state-run news agency , SANA , said a number of `` terrorists , '' including non-Syrian citizens , had been killed in clashes with government forces in the Damascus suburbs . Others were killed in clashes with government forces in Deir Ezzor , the news agency said . The Syrian government has consistently referred to anti-government forces as terrorists . China urges 'political resolution ' to Syria crisis .
NEW : Death toll rises to 149 , opposition activists say , after days of grim tolls . State media : Government forces killed `` terrorists '' in Deir Ezzor and outside Damascus . Opposition groups claim that the death toll is higher than 150. Shells and bombs are thundering in and around Damascus , the opposition says .