Israel carried out air strikes in the Palestinian territory of Gaza on Friday night. Palestinian medical workers say at least 10 people were wounded.
Israeli aircraft raided a stronghold of security forces of the Islamic fundamentalist group Hamas, which effectively controls Gaza. They also hit other objects, including tunnels running along the Egyptian border that are used in smuggling.
The strikes came after a rocket fired from Gaza hit the southern Israeli city of Ashkelon on Friday morning. Its explosion caused no casualties but damaged a building and several cars.
The number of rockets fired from Gaza into the city more than 10 kilometers away shrank dramatically after the Israeli military ended its large-scale military attack last year.
Israeli Prime Minister Benjamin Netanyahu warned in a statement that he took the rocket attack very seriously.
On the previous day, Arab League foreign ministers had agreed to support direct peace talks between Israelis and Palestinians.
The attack is believed to have been carried out by militants in an attempt to obstruct the peace process. The exchange is feared to raise tensions with Palestinians.