21.   The steel ladder to the floor of his garage was electrified to prevent escape.

22.   The three windows on the second floor were covered with ornamental ironwork grills that were padlocked to prevent escape.

23.   The troops here, the first Pakistani government soldiers ever to enter this border region, are charged with preventing the escape of al-Qaida or Taliban forces.

24.   Pakistan closed its border to prevent escape by any al-Qaida or Taliban members fleeing the fight.

25.   Pakistan closed its border to prevent escape by any fleeing al-Qaida or Taliban members.

26.   A padlock on one of the two doors and iron bars on the windows prevented escape through those routes, officials and students said.

27.   All doors and windows were locked or barred to prevent escape, he added.

28.   An official said only one police guard is assigned at the center at any time and more guards are needed to prevent escapes.

29.   But the nine who crowded around the Bangladeshi, preventing his escape and supporting the attackers, were set free, police said.

30.   Doors and windows would be locked or barred to prevent escape, he said.