They said the attackers were in contact with their accomplices in Balochistan. CID officials said huge cache of weapons was recovered from the arrested suspects.
The attackers had arrived in Karachi via route of Balochistan and received training from a training centre near Afghanistan border, told the officials, adding one of the attackers was a mastermind of the attack.
The involvement of banned terrorist outfits and al-Qaeda factions in Karachi airport attack has now been confirmed.
