The explosive devices were fitted with timers and planted on cycles, a modus operandi similar to the one used in last year's blasts in court premises in Uttar Pradesh in which HUJI was involved, police said.

Eight persons including a man injured in the blasts and a rickshaw puller are being questioned, they said, noting that seven teams of Rajasthan police and intelligence branc

have begun the probe into the blasts.

"It was a cent per cent a terrorist attack on the pattern of blasts in the court premises in UP in November last year.

RDX was used in containers tagged to cycles along with timer devices," Additional Director General of Police (Crime) A K Jain said.

An examination of the blast sites indicated that the bombs were filled with ball bearings and small iron pieces to act as splinters, sources close to the investigation said.

HUJI may have been able to form sleeper cells in Rajasthan, they said, adding that a proper investigation into the blast at a sufi shrine in Ajmer last year could have been a pointer.

"We have collected sufficient evidence from the places of the blasts. They are being analysed by our technical experts," Superintendent of Police, Jaipur, Raghvendra Suhasa said, noting that one unexploded bomb, found from the blast site, has been defused.

Union Home Secretary Madhukar Gupta told reporters in New Delhi that "our priority now apart from vigilance and being on the alert will be to get hold of the people responsible" for the blasts.