Israeli prime minister vows to turn Hamas strongholds ‘into ruins’

Fire and smoke rises following an Israeli airstrike, in Gaza City (Fatima Shbair/AP)

Israel’s prime minister Benjamin Netanyahu has warned people living in Gaza to leave as he vowed to turn parts of the territory “into ruins”.

Mr Netanyahu earlier declared Israel was at war after Hamas militants broke out of the blockaded Gaza Strip on Saturday to launch an early morning attack.