@dailymailuk: A Sky News journalist was filming live in Beirut when a huge blast echoed throughout the city this afternoon. International correspondent John Sparks was giving analysis of Hezbollah leader Hassan Nasrallah's first speech since deadly explosions rocked Lebanon on Tuesday and Wednesday when a loud explosion interrupted filming. It was unclear what caused the explosion. Hezbollah has fired rockets into Israel since the attacks earlier this week, which Israel has not claimed responsibility for. Israel said last night it was at the start of a new phase in its war. #lebanon #beirut #attack #explosion #news