GAZA CITY, Gaza Strip — A deadly Israeli airstrike into the Gaza Strip and rocket and mortar fire from the Palestinian territory on Sunday marred a fragile truce that took hold late last week.

Gaza health official Ashraf al-Kidra said one early morning strike killed one Palestinian man and wounded another. Israeli police spokesman Micky Rosenfeld said five rockets and mortars struck southern Israel by early morning, and that school in the southern Israeli city of Beersheba was canceled.

The identity of the dead Palestinian wasn't known. The Israeli military said it targeted a militant squad that had fired a rocket at Israel.

It said it later launched another air attack that also targeted a rocket launching site. No casualties were reported in the second airstrike.

The hostilities disrupted an informal truce that went into effect Wednesday after two days of rocket and mortar barrages and airstrikes.

Five Palestinians were killed in that outbreak of violence and two foreign laborers in Israel were critically wounded.