Militants attacked a government building under construction in Egypt's restive northern Sinai region on Saturday, killing at least four workers, a security source said. Six other workers were wounded in the attack, the source said.
Egyptian security forces had cordoned off the area and launched a manhunt for the attackers. Witnesses said masked militants opened fire at the building near al-Arish airport and set fire on two vehicles before they fled into the desert.
No group has yet claimed responsibility for the attack.