Israeli aircraft have struck tunnels in the Gaza Strip, Palestinian witnesses say, a day after two explosive devices said to have originated in Hamas-ruled Gaza washed up on Israel's coastline.
The Israeli army had no immediate comment on the alleged strikes on Tuesday which witnesses say were carried out by Israeli air force jets against an abandoned airport building in Gaza and on tunnels along the border with Egypt that Israel says are used to smuggle weapons into the territory.
There were no immediate reports of injuries from the bombings, according to the witnesses cited by the Reuters news agency.
The attacks came shortly after Binyamin Netanyahu, the Israeli prime minister, told a news conference alongside his Italian counterpart, Silvio Berlusconi, that Israel would respond to the explosives found on Monday.
Palestinian fighters from the Israeli-blockaded territory claimed responsibility for what Israel described as an unusual attempted attack.
Most attacks from Gaza in the past few years have been by rocket shootings at Israeli towns.
The Islamic Jihad group said it had floated the explosives out to sea in a joint operation with two other groups including the al-Aqsa Martyrs Brigades, the armed wing of the Fatah faction led by Mahmoud Abbas, the Palestinian president.