Israeli airstrikes destroyed a tower block in Gaza City after Hamas militants launched a rocket and air attack on Israel in the early hours of Saturday morning.

The Israeli army launched Operation Iron Swords against Hamas in the Gaza Strip, with Israel's president, Benjamin Netanyahu, saying the country, is 'at war'.

Al Jazeera journalist Youmna El Sayed was reporting live from Gaza the moment the missile struck Palestine Tower behind her.

Sources in Gaza said at least 198 Palestinians were killed in the strikes