During peace talks , suicide car bomber in Syria kills people near mosque , official says . U.N. officials fear violence and mass exodus at Russian military buildup . Russia : Russians ` ` need to back up ... words with actions , '' U.S. official says . Two warring sides blames each other for the lack of progress in peace talks .
During peace talks , suicide car bomber in Syria kills 32 near mosque , group says . U.N. officials fear bloodshed and mass exodus at one military buildup . NEW : Russians `` need to back up ... words with actions , '' U.S. official says . Two warring sides blames each other for the lack of progress in peace talks .