Israel has struck a number of targets in Gaza, killing at least three people and injuring dozens more, after vowing a severe response to rocket attacks on its soil.
One strike destroyed the second floor of a two-storey building belonging to Hamas' Executive Force, which has the task of maintaining security in Gaza.
The force of the blast destroyed several other buildings, as terrified residents sought safety in the open.
The attacks come as efforts to end five days of fighting between rivals Hamas and Fatah - that have left up to 40 people dead - faltered again.
More than 50 rockets have fallen on the Israeli town of Sderot in the last three days, the Israeli army says.
At least two Israelis suffered injuries in the attacks, reports say.
A college and a secondary school were also hit, causing shock and distress but no reported injuries.
Israeli tanks moved a few metres into the eastern Gaza Strip, although military officials said there were no plans for a ground attack.
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