An Israeli air strike on a school sheltering displaced families in Gaza killed 10 people on Wednesday, an attack that Israel said targeted militants operating from within the complex. Since a January ceasefire collapsed on March 18,

France, Germany and Britain meanwhile said Israel's seven-week blockade on all imports to Gaza was "intolerable."

Israeli strikes have killed at least 17 Palestinians in the Gaza Strip, mostly women and children, and destroyed bulldozers and other heavy equipment that had been supplied by mediators to clear rubble.