11.   The tribal belt in the north is a wilderness with virtual fortresses ensconced in the craggy mountains.

12.   Most privately-run schools have turned into virtual fortresses and jittery parents have escorted children to classes since the outbreak of kidnappings began.

13.   Police will use army helicopters in their battle against the militants, who have turned the dense sugar cane plantations into virtual fortresses, Al-Mussawar magazine said.