Israeli jets and helicopters have attacked Gaza, injuring three children and hitting what the Israeli military said were weapons manufacturing and storage sites.

The attacks continue the escalation in violence around Gaza in recent weeks. A day earlier Israeli had dropped leaflets in southern Gaza warning of an attack.
The number of rockets fired from Gaza by Palestinian militants has begun to increase and a week ago two soldiers and two Palestinian gunmen were killed in the most serious clashes on the border for more than a year.
There were at least seven Israeli missile strikes overnight. Two caravans near the southern town of Khan Younis were hit as well as a cheese factory in Gaza City and a metal foundry in the Nuseirat refugee camp, according to reports. Hamas said a complex it built for making movies was damaged, the Associated Press reported.
The Israeli military said a rocket was fired into southern Israel on Thursday and there were nearly 20 rocket and mortar attacks in March. Two weeks ago a rocket killed a Thai worker in Israel.
Britain on Friday called for restraint and urged Israel and the Palestinians to renew talks. A Foreign Office spokeswoman said: ""We are concerned by today's strikes and the escalation of violence in Gaza and southern Israel over the past week. We encourage Israelis and Palestinians to focus efforts on negotiation and to engage urgently in U.S.-backed proximity talks.""
Hamas, the Islamist movement that won Palestinian elections four years ago and controls Gaza, has tried in recent months to curb rocket fire. But it also said its fighters were involved in a gun battle a week ago in which two Israeli soldiers were killed and released video footage apparently taken during the fight.
On Friday, Hamas said it had contacted armed groups in Gaza in an apparent attempt to rein in their attacks.
A statement by the Hamas government accused Israel of an escalation against the territory. But it also said the Hamas government was ""making contact with the factions to safeguard internal agreement"".
Israel led a devastating war into Gaza in January last year that killed nearly 1,400 Palestinians. Thirteen Israelis died. For months afterwards the area was quiet, with both sides apparently keen to prevent further fighting.
Israel is continuing a tight economic blockade on Gaza, preventing exports and limiting imports to a small number of aid and food items.