The attacks targeted two Hamas military sites and a munitions manufacturing site, the military said in a statement, without specifying whether the raids had resulted in casualties.

"Fire balloons" and kites carrying flammable material have become symbols of the Palestinian border protests in recent months.

The Israeli army on Saturday wounded two Palestinians in the Gaza Strip attempting to launch incendiary balloons across the border into Israel, officials said.

Since major border protests broke out at the end of March, more than 300 fires have devastated several thousand hectares of fields and shrubland, the Israeli fire service has said.

According to Israel's Defence Minister Avigdor Lieberman, 400 kites have been intercepted from some 600 launched since the start of the recent protests.

At least 130 Palestinians have been killed by Israeli gunfire in the same time span. No Israelis have been killed.

Palestinians are calling to return to the homes their families fled or were forced from in 1948 during the war surrounding the creation of Israel.

The Gaza Strip is controlled by the Islamist movement Hamas which Israel considers its chief enemy.

The two sides have fought three wars since 2008 and observe a tense ceasefire.