Security was put on high alert in Islamabad, Chaman and Swat following the killing of Al-Qaeda leader Osama bin Laden in an operation in Abbotabad last night. According to the reports, special measures were taken after the killing of Ladens to avert any untoward incident. Travel documents of those traveling to Pakistan from Afghanistan were being carefully checked at Pak-Afghan border. On the other hand, security has been beefed up at all check posts in Swat.