Hezbollah`s leader on Friday denied accusations that his Iran-backed movement has arms warehoused at Beirut port, calling for an investigation into the biggest explosion to hit the Lebanese capital. In a televised speech, Sayyed Hassan Nasrallah called Tuesday`s explosion "an exceptional event" that required unity and calm. The heavily armed Shi`ite Hezbollah would make its political position clear after the dust settles, he added.