Syrian opposition resumes tough talks on unity key to peace push

ISTANBUL (Reuters) - Syria's opposition resumed talks on Saturday aimed at closing their fractious ranks, crucial to launching an international peace conference, and government forces pressed an onslaught on a rebel-held town to try to gain the upper hand in civil war.

Failure of the opposition to unite could weaken the hand of conference co-sponsors Russia and the United States in ending Syria's conflict, which has killed 80,000 people, threatens to spill across borders and whip up wider sectarian conflict.