A suicide bomber driving a garbage truck packed with explosives rammed his vehicle into an Egyptian security checkpoint outside a police building in northern Sinai on Monday, killing at least 10 people and wounding 22, officials said. According to security and medical officials, the attack in the city of el-Arish in the Sinai Peninsula was followed by smaller explosions as militants wearing black masks fired rocket-propelled grenades at the troops around the checkpoint. Three floors of the police building were blown out, the officials said. There were unconfirmed reports that a number of security personnel were seized and abducted by the gunmen. No group immediately claimed responsibility for Monday’s attack, which bore all the hallmarks of Egypt’s Islamic State affiliate.