Kolkata: A day after the National Investigation Agency (NIA) captured the key conspirator of the Burdwan blast, in a major breakthrough, the West Bengal police on Saturday arrested the Jamaat-ul-Mujahideen Bangladesh (JMB) commander Sajid, the mastermind of this case.

"ATS team in association with CID & Kolkata police have been able to arrest main accused in Burdwan blast," said Bidhannagar Commissioner Rajeev Kumar, ANI reported.

He further said, "He (Sajid) revealed during the interrogation that he was heading the module."

Kumar added that Sajid was arrested under section 41 CrPC Act. "ATS team was following an info on illegal money transaction, seized 1 lakh rupees, arrested him under 41 CrPC," Kumar said.

With the arrest of Sajid, on whose head the NIA had announced a cash reward of Rs 10 lakh, the exact plan of the terror group is likely to come to fore.

According to reports, Sajid was arrested by West Bengal Police a couple of days back, official sources said today but refused to immediately divulge the exact location and circumstances leading to his arrest.

Sajid had been extensively questioned by the police and sleuths of central agencies about the functioning of JMB and its plans within the country and in Bangladesh.

Yesterday, the NIA had arrested Zia-ul-Haque, the key conspirator and a close aide of Sajid.

The NIA had on Thursday detained a man in connection with this case and took him to Kolkata for questioning.

Sources in the NIA, probing the blast case, had said that the agency detained the person from near the Burdwan railway station.

The NIA had recently released photographs of the 12 suspects and announced a cash award of Rs.5 lakh on Shahnur Alom.

Both Shahnur Alom and Sujina were on the wanted list of the NIA, which is probing the blast case.

Earlier, NIA officials had collected the viscera samples of Shakil Ahmed and Swapan Mondal alias Sovan who died in the Khagragarh blast in Burdwan on October 2 from the morgue here.

Another team of the NIA had gone to the Mangalkote police station and talked to the officer-in-charge of the police station, Sanjay Kundu, to collect information.

Two persons were killed in the accidental blast in a house at Khagragarh in Burdwan district while hand grenades were being manufactured there, leading to the unearthing of an international terror link to it.

(With Agency inputs)