The antecedents of people who have been detained are being checked thoroughly to establish whether anyone from outside the city had come and stayed with them in the days before the blasts.

Though the focus is HuJI, sources said the police have not ruled out the role of other terror organisations.

Police have been able to prepare sketches of three other suspects after questioning eyewitnesses. Among the eyewitnesses who helped in the process was the owner of the shop from where a bicycle was purchased. Police have also detained a few persons who resembled the man in the first sketch released by the police last night.

Meanwhile, Chief Minister Vasundhara Raje announced the formation of a special team to deal with terror. “We have decided to form a SIT under an IGP-level officer to investigate the serial blasts,” she said.

In New Delhi, police detained three Afghan nationals for questioning from old Govindpura area in East Delhi. One of them reportedly resembled the sketch put out by the Jaipur police. DCP (East) Ajay Chowdhury said: “We did question them but nothing has been found against them”.