GAZA CITY, Gaza Strip (AP) — Palestinian militants targeted densely populated Tel Aviv in Israel’s heartland with rockets for the first time Thursday, part of an unprecedented barrage that threatened to provoke an Israeli ground assault on Gaza. Three Israelis were killed.

Air raid sirens wailed and panicked residents ran for cover in Tel Aviv, Israel’s commercial and cultural capital. Israel responded by moving troops and heavy weapons toward Gaza and authorizing the call-up of tens of thousands of reservists.

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