He also said that CDs, DVDs and other items are also being looked into by the CID. The Criminal Investigation Department (CID) is investigating over 1,800 telephone numbers from which telephone calls were either received or were taken to from the mobile phones of the bombers involved in the Easter Sunday attacks.Police media spokesman Ruwan Gunasekera said that the CID is also investigating laptops, desktops, mobile phones and tabs used by the bombers.