NORTH SINAI, Oct 18 (Aswat Masriya) – A military officer and a row officer were killed in North Sinai on Saturday when a tunnel collapsed as they were inside, leaving a conscript injured and two more soldiers missing, a security source said.

The security source, who preferred to remain anonymous, told Aswat Masriya that security forces were destroying a tunnel at the border of North Sinai's Rafah City with the Gaza Strip, when the tunnel suddenly collapsed.

Egypt's security forces have intensified their security measures in North Sinai in reaction to repeated militant attacks that target army and police officials, which rose significantly since the military ouster of former President Mohamed Mursi last year.

Border guards have been destroying underground tunnels connecting Egypt's Sinai to the Palestinian Gaza strip since August 2012, when unidentified assailants killed 16 border guard conscripts.