Hundreds of thousands of people packed into a stadium in Beirut and the streets outside Sunday for the funeral of Hezbollah's former leader, Hassan Nasrallah, nearly five months after he was killed in an Israeli airstrike.

BEIRUT—As tens of thousands of people gathered for the funeral of slain Hezbollah leader Hassan Nasrallah in Beirut on Sunday, its current chief vowed to continue fighting Israel as the group projected its power despite an Israeli offensive that has left it weakened and in disarray.

Large crowds have gathered for the funeral of Hezbollah's former leader Hassan Nasrallah, who was killed in an Israeli air strike in Beirut in September. Mourners dressed in black flocked to a stadium on the outskirts of the Lebanese capital on Sunday.