The CID which took over the investigation from the State police at Khagragarh bomb blast site in Burdwan town on Saturday chanced upon half-burnt documents that pointed the needle of suspicion towards the Indian Mujahideen, police sources said.
Officials also said that names of some leaders and foreign terror groups have also cropped up during the investigations adding the CID on Saturday recovered another mobile phone near the blast site.
The police had earlier seized to sets but there were no sim cards in them. The thirds set could yield some valuable information sources said adding central forensic team and the NIA had also reached the area.
Two persons both suspected terrorists, were killed and two others were injured in the blast that reportedly occurred accidentally at Khagragarh locality a couple of days ago. The wives of the twosome killed had been arrested for interrogation.
The police had recovered some incriminating papers, IED, wires etc from the spot. The investigators were now trying to ascertain whether the incident was a part of any bigger plan.