The number of raids and casualties in one evening showed the rising tension between Israel and Hamas, the Islamist group that controls Gaza.

Hamas has stepped up rocket salvoes into Israel after a hiatus since the two sides fought a war two years ago, claiming responsibility for firing more than two dozen mortar shells and rockets at the weekend.

The Israeli military said its warplanes fired at six targets on Monday in response to a rise in rocket and mortar attacks on Israel. About 130 attacks had been made on Israel this year, 56 of them since Saturday, a military spokesman said.

He said the military held Hamas "solely responsible for terrorist activity in the Gaza Strip and warns Hamas not to continue its aggression."

Hamas medical officials said 19 people were wounded in the Israeli air strikes, including four militants, seven children and two women.

Reuters