Increasing the worries of security establishment, investigations into Burdwan blasts have revealed a new trend of women taking to Jehadi indoctrination and terror activities.

The two madrasa in question after Burdwan blast– at Shimulia in Burdwan and at Laal Gola in Murshidabad - were imparting training only to the women in bomb making and other terror activities like transporting arms and ammunition safely from one area to the other, sources said.

The role of women that comes as a surprise to investigators has created problems in plenty for the security agencies, as by virtue of being a closed society it is not easy to check and apprehend women.

"We are still in the process to ascertain as to how many women had got trained at the two madarsas and at what level. As of now 40 suspects have been rounded up, four of which have been formally arrested," sources said.Interrogation of the suspects have also revealed that at least four containers each having 30 IEDs (improvised explosive devices) were transported to Bangladesh from 2011 to 2014.

These bombs were not very sophisticated pipe bombs but potent enough to kill and damage.

Requested by Bangladesh to share full investigation details, Research and Analysis Wing (RAW) is expected to prepare a dossier soon and send it to Dhaka through ministry of external affairs.

Meanwhile, on Tuesday a team of National Investigation Agency visited the Enforcement Directorate's office for sharing information between the two agencies. "Yesterday, three officers from the Terror Funding Cell of the NIA in Delhi came to our office to chart out future coordination, sharing information and working out a road map for an effective probe into the Burdwan blast," said a top source in the ED.

He said that shortly after the blast, which took place on October 2, a team of ED officials had visited the blast site to ascertain the funding module and whether any money laundering offences were involved. It was decided that there would be regular meetings between officials of both the ED and NIA for better investigation of the case. A team of ED officials left for the blast site on Tuesday, along with NIA officials, he said. On Monday, National Security Advisor Ajit Doval along with senior Home Ministry officials visited the blast site, which was preceded by the visit of NIA DG Sharad Kumar