ISMAILIA — Three Egyptian policemen and a soldier were injured near the Sinai town of Sheikh Zuwaid on Saturday when armed men fired a rocket-propelled grenade at their convoy during an operation against militants following the killing of 16 border guards. The attack took place while the police were on their way back to the city of Al-Arish after arresting two suspects at the border town of Rafah, a security source said. “The forces were entrapped by extremists when they were returning from a raid in Rafah ... one armored vehicle was targeted by a rocket," the source said. They could not identify or pursue the attackers, he added. Disorder has been spreading in turbulent North Sinai, a region awash with guns that has felt neglected by the central government since the overthrow of President Hosni Mubarak last year. — Reuters