Israeli forces pounded the Gaza Strip on Wednesday, sending thousands of residents fleeing, and said it was meeting stiff resistance from Hamas Islamists, as U.S. Secretary of State John Kerry flew to Tel Aviv to push ceasefire talks.

In a blow to Israel's economy, U.S. and many European air carriers halted flights to the country citing security worries after a militant rocket from Gaza hit a house near Ben Gurion airport. Israel urged are-think, saying its airspace was safe.