At least 22 people have been detained in connection with the serial blasts in Delhi, as police launched a massive hunt to nab the culprits.
Police raided scores of places across the capital, including Paharganj, Chandni Chowk, Zakir Nagar, Okhla, Lajpat Nagar and Nizamuddin throughout Saturday 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 Lashkar-e-Tayiba in league with al-Qaeda.
Al-Qaeda's involvement is suspected because the bombs were constituted in a different way from that used by outfits in Jammu and Kashmir.