Calcutta, Sept. 14: Calcutta police today arrested Jamaat-ul-Mujahideen Bangladesh operative Burhan Sheikh, who was wanted in connection with the 2014 Khagragarh blast.

An award of Rs 3 lakh had been announced on Burhan by the National Investigation Agency, which is probing the blast.

"He was an important link in the Khagragarh episode. He was instrumental in imparting arms training at the Simulia madarsa in East Burdwan district where young boys were indoctrinated," said an officer attached with the case.

Burhan, whose name features in the NIA chargesheet, has been charged under provisions of the Unlawful Activities (Prevention) Act and other sections of waging war against the nation.

The 2014 Khagragarh blast had claimed two lives and blown the lid off the JMB module active in Bengal. The incident had led to the seizure of a cache of improvised explosive devices from the flat that turned out to be an explosive-manufacturing unit from where finished explosives were allegedly smuggled across the Bangladesh border.

Sources said Burhan, originally from Mangalkot in East Burdwan, had been living at Ranitala in Murshidabad.

"He, along with Sheikh Yusuf, had bought the land in Simulia where the madarsa was later set up," said an NIA officer.

Sources said the police had received information that Burhan was coming from Murshidabad and arrested him from B.B. Ganguly Street in Calcutta.

He would be handed over to the NIA tomorrow.