Israeli warplanes struck targets in the Hamas-run Palestinian Gaza Strip on Friday, wounding six people after a rocket and mortar rounds were fired into Israel from the coastal enclave.

The jets bombed three sites Friday afternoon and then later in the evening destroyed two smuggling tunnels from the southern Gaza town of Rafah to neighbouring Egypt, Palestinian officials and the Israeli army said.

"The targeting of these terror-linked sites was in response to the firing of rockets at Israel's southern communities over the past two days," the military said.

In a statement, it said 10 mortar rounds and a military-grade Grad-type rocket were fired into Israel from Gaza, causing no casualties.

Adham Abu Selmiya, a spokesman for the Hamas-run medical services in Gaza, said four people were wounded in a strike that targeted a house east of the central town of Deir al-Balah.

The injured, who included two women, were taken to Shuhada al-Aqsa hospital, he told media.

A separate air strike on the southern town of Khan Yunis lightly wounded two people, one of them a child, Abu Selmiya added.

There were no casualties reported in the night-time raid on Rafah.

The Israeli military said the strike near Deir al-Balah targeted two tunnels being dug towards the border with southern Israel, but had no details on the attack in Khan Yunis.

Earlier on Friday, a Soviet-designed Grad rocket fired from Gaza damaged a tanker truck in an attack the Israeli military described as "the first of its kind for several months."

Grad-type rockets have a range of up to 40 kilometres (25 miles), about twice the distance of the home-made Qassam rockets normally used by Palestinian militants in Gaza.

Israeli media reported that one of the mortar rounds fired at Israel was a white phosphorus bomb. Police could not immediately confirm the report, however Palestinian militants have fired such projectiles in the past.

Israel came under heavy criticism during the 22-day offensive it launched on Gaza in December 2008 for using these rounds and has since then changed its procedures for using phosphorus

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