CAIRO, (AFP) -- Egyptian security forces killed 10 "terrorist" gunmen and captured 20 in an operation in the Sinai Peninsula over the past 48 hours, state news agency MENA reported on Sunday. "Security operations carried out by the armed forces and police in north Sinai to hunt down armed terrorists... (resulted) in the liquidation of 10 of these armed terrorist elements," the agency said, citing a security source.