Israeli helicopter gunships hit targets in the Gaza Strip early Tuesday, in response to rockets fired into Israel from the Palestinian territory.
There were no reports of casualties arising from either attack.
Palestinian witnesses say the Israeli missiles hit a northern Gaza office of Palestinian leader Mahmoud Abbas' Fatah party at Beit Lahyia. Israeli officials say the buildings they targeted were used by Fatah-linked militants of the al-Aqsa Martyrs Brigades, which claimed reponsibility Monday's rocket attack against Israel.
An Israeli plane also dropped a bomb on a nearby road.
Israel has warned it will enforce a buffer zone in northern Gaza to stop militants who have continued to aim makeshift rockets at Israel despite the Jewish state's withdrawal from Gaza in September.
Some information for this report was provided by AFP, AP, and Reuters.