Police raided scores of places across the capital, including Paharganj, Chandni Chowk, Zakir Nagar, Okhla, Lajpat Nagar and Nizamuddin throughout the night, police sources said on Sunday. At least 22 people were picked up for questioning by the joint teams of Intelligence Bureau and police, the sources said. Investigators said that the bomb blasts could have been carried out by Pakistan based Lashker-e-Taiba in league with Al Qaeda. Al Qaeda's hand is suspected considering the way the bombs were constituted was different from that used by the outfits active in Jammu and Kashmir.