The UJC comprises militant outfits like Jamiat-ul-Mujahideen (JuM), jaish-e-Mohammed (JeM) and Al Badr reportedly met on February 13 to avenge the execution of Afzal Guru, convicted in the 2001 Parliament attack case.
Sources added that five sleeper cells were involved in the twin blasts in Dilsukhnagar on Thursday evening. The explosives used in the attack were bought in Hyderabad itself and it was learnt that a team of National Investigation Agency would soon go to Darbhanga in Bihar to find more clues.
Earlier reports suspected that delayed timer was used to denotate the explosives. A delayed timer helps the bomb-planter enough time to escape the blast site after installing the device.
Meanwhile, unidentified bags were found near Andhra Pradesh Bhavan in Delhi on Friday. Police had sealed off the area and disposal squad was informed. The bags were later found to be filled with clothes.