Benazir Bhutto International Airport on high alert . CNN 's Zein Basravi and Reza Sayah , and Journalist Nasir Habib contributed to this report . The airport is the main hub for international flights to and from Pakistan, but it has been closed since last week because of a bomb scare that was linked to al Qaeda in Pakistan. Officers combed through the airport compound looking for explosives . Danish intelligence says one of its employees was killed in Marriott hotel attack .
Benazir Bhutto International Airport on high alert . The airport is the main hub for international flights to and from Pakistan, but it has been closed since last week because of a bomb scare that was linked to al Qaeda in Pakistan. Officers combed through the airport compound looking for explosives . Danish intelligence says one of its employees was killed in Marriott hotel attack .