Israeli aircraft have hit two tunnels in the southern Gaza Strip, the Israeli military has said.

Palestinian security officials confirmed the attack on Thursday, but said there were no injuries.

Officials of the Palestinian group Hamas said two other strikes hit a military training facility close to the town of Khan Younis in the central Gaza Strip.

Israel said the strikes were in response to recent rocket attacks on Israel by fighters in Gaza, stating that they would "respond to any attempt to disrupt the calm in Israel's southern communities".

Israel launched a war on the Hamas-ruled Gaza territory in December and January last year.

More than 1,400 Palestinians were killed in the war.

Dozens of tunnels are said to criss-cross between southern Gaza and Egypt's Sinai desert, providing a lifeline to Gaza residents who are starved of basic supplies due to Israel's blockade of the territory.

Sources say there are more than 6,000 Palestinians employed in the clandestine industry.