The latest Israeli air strikes on Gaza include the first apparent targeting of a top Hamas political leader.
Israel resumed air strikes about six hours after an attempt at a cease-fire collapsed.
Gaza health officials say the attacks killed at least seven Palestinans and destroyed the house of senior Hamas leader Mahmoud Zahar. Zahar is believed to be in hiding elsewhere.
The Israeli military warned residents of northern Gaza to evacuate their homes ahead of the renewed attacks.
Gaza militants have fired at least 150 rockets across the border at Israel since yesterday.