NEW : The militants used suicide vests at Karachi 's airport , a military spokesman says . NE : Militants were contained to a maintenance area at the airport , he says . It was not immediately clear who the militants were or why they staged the assault . 21 people were killed , including 10 militants , officials say . Fires started at the airport in at least two locations ; people line up outside .
NEW : The militants used suicide vests at Karachi 's airport , a military spokesman says . NE : Militants were contained to a maintenance area at the airport , he says . 21 people were killed , including 10 militants , officials say . Fires started at the airport in at least two locations ; people line up outside .