An Israeli air strike hit a public garden in the Beach refugee camp in northern Gaza killing five people, three of them children, according to medics, ending a relative lull in fighting during the Muslim Eid holiday.

Another explosion shook the grounds of Gaza's main Shifa hospital on Tuesday, Reuters witnesses said. It was not immediately clear if there were any casualties.

Israel and Palestinian militants in Gaza have been locked in three weeks of fighting which have killed 1,049 people in Gaza. Some 50 Israeli were killed.