It came as a Palestinian rocket landed in Sderot
Israel and Palestine have traded rocket fire, with reports that Israeli armed forces struck Gaza 50 times in 24 hours.
It is believed Palestinian militants in the Gaza Strip launched a rocket that landed in the Israeli border town of Sderot on Sunday.
Police say the rocket caused no injuries or damage in the residential area where it landed.
Israeli aircraft and tanks responded by shelling the Gaza town of Beit Hanoun, the army and police said.
An Israeli shell damaged a water tower, while multiple air strikes later reportedly hit at least 30 different sites.
Two people were lightly hurt, Gaza health officials told Reuters.
But Sinn Féin Senator Paul Gavan has hit out at the action.
"Yesterday evening, the Israeli army fired 50 strikes on Gaza, causing chaos and injury to the Palestinian community," he said.
"In the aftermath of the attack, several civilians are being treated for shrapnel injuries and 30 different sites were demolished by the air strikes in Gaza."
"Last week, myself and Sinn Fein MLA Fra McCann spent three days meeting dozens of civilians who are victims of the ongoing occupation of Palestine. We heard the personal testimony of state killings, torture, imprisonment of children, mass scale internment without trial, house demolitions and systematic apartheid."
"These latest bombings are further evidence of outrageous Israeli aggression," he added.