The Israeli defence minister has approved the call-up of 30,000 reservists, Sky News has confirmed with the Israeli Defence Force.

Sky's Middle East Correspondent Sam Kiley said: "This is a strong indication that Israeli troops are preparing to go into the Gaza Strip."

Earlier, Palestinian militants in the Gaza Strip fired missiles at Tel Aviv, Israel's largest city.

One fell in an open area near the city of Rishon Lezion on the outskirts of Tel Aviv and caused no damage or injuries.

Air raid sirens later sounded in Tel Aviv and witnesses said they heard an explosion. But a military spokesman said that rocket had landed in the sea.

With claims that Palestinian militants fired nearly 150 rockets on Thursday, killing three people, defence officials said Israel was prepared to launch a ground invasion into Gaza if necessary.

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[link to news.sky.com]