Guess who is getting on the nerves of the Central Industrial Security Force (CISF) at Raipur’s Mana airport? A thief with a penchant for expensive mobile phone handsets. Staffers at the airport have been losing their costly mobile handsets far too frequently for comfort. In the last three months, about a dozen handsets have been stolen. CISF personnel scanning passengers at the airport are in a fix. The victims have lodged a complaint with the Mana police after the CISF failed to trace the culprit. But since the matter is related to internal security, it has now been transferred to the crime branch.