JERUSALEM (AP) — Israel's prime minister says the army is prepared for a "significant widening" of its operation in the Gaza Strip.

Benjamin Netanyahu told reporters on Thursday that Israel has "made it clear" it won't tolerate continued rocket fire on its civilians.

He says he hopes Hamas has received the message. But if not, he says Israel will take whatever action is necessary to protect its people.

Israel launched the operation on Wednesday, killing Hamas' military chief and attacking dozens of rocket-launching sites.

Officials have said Israel is prepared to broaden the offensive with a ground invasion of Gaza if necessary.