The tunnels bring food, goods and weapons into blockaded Gaza
Four Palestinians have been wounded in an Israeli air raid on tunnels between the Gaza Strip and Egypt, Palestinian medics have reported.
Israel confirmed the air raid, which it said was in response to a rocket fired from Gaza into Israel on Tuesday night.
The rocket caused neither casualties nor damage.
Tunnels are used to smuggle food and other goods into Gaza which is subject to an Israeli-Egyptian blockade. Militants use them to bring in weapons.
The Islamist militant group Hamas has controlled the territory since it took it over by force in June 2007.
The area has seen sporadic violence since the end of the Israeli assault on Gaza in December and January. Palestinian and human rights groups estimate that about 1,400 people were killed in the three-week conflict.
A recent report for the UN Human Right Council said their was evidence Israel committed war crimes and crimes against humanity in that conflict.
It accused Hamas of war crimes by deliberately targeting Israeli civilians and trying to spread terror with rocket attacks.
The strip is subject to a strict blockade by Israel, and Egypt which controls Gaza's southern border, under which all but the most basic food and medical goods are forbidden entry.