The latest Gaza truce is under threat on only its fifth day after rockets were fired at the Israeli town of Sderot.
Islamic Jihad claimed responsibility for the attack, which caused slight damage to a garden. The militant group said it was a response to the killing of one of its leading commanders by Israeli troops on Monday night in the West Bank.
The truce requires Israel to halt military operations in Gaza and calls on Hamas to prevent rockets being fired from the Strip, which it seized control of last year.
Reponding to the latest attack, Hamas said it will talk to armed factions in Gaza in order to maintain the ceasefire.