Al-Jazeera Video: As it happened: Huge airstrike in Gaza

"Have a listen to what happened as our Al Jazeera news presenter was speaking to our correspondent Nicole Johnston in Gaza.

Moments later Johnston tweeted that the Israeli airstrike hit a police station, some 400m away from Al Jazeera's offices.

Drones and aircrafts are constantly circling the strip which has about 1,500,000 people living in it."