Omar Farooq alias Mohammed Aftab Khan was arrested by the STF sleuths from the Nepal border area when he was trying to escape to the neighbouring country, the officer said.
With this, the total number of people arrested by the Kolkata Police for their alleged links with the Bangladeshi terrorist group has risen to five.
The sleuths had announced a reward for any information on Aftab and two others -- Shopon Biswas alias Tamim and Nayan Gazi alias Zafor.
The accused was attached to the banned terror outfit's explosives wing and was an expert in preparing improvised explosive devices (IEDs), the officer said.
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Aftab had entered India with the help of Mohammad Sahadat Hossain, who was arrested from central Kolkata last week, he added.
The accused, along with Tamim, had stayed at a hotel in Howrah for a couple of days, the officer said.
The STF had last week arrested two ABT terrorists, Samsad Mia and Rizaul Islam, along with an arms supplier, Monotosh Dey, from the Kolkata railway station and seized several fake identity cards and arms from their possession.