On a visit to Beirut, US envoy Amos Hochstein warns the clock is ticking for a Gaza ceasefire that could also help end 10 months of cross-border exchanges between Lebanon's Hezbollah and Israel. "The more time goes by of escalated tensions ... the more the odds and the chances go up for accidents, for mistakes, for inadvertent targets to be hit that could easily cause escalation that gets out of control," warns Hochstein. IMAGES AND SOUNDBITES - TO COMPLETE: 36E97WB_EN