The accused Mitu Akter, 30, resident of Daulatpur village in Moulvibazar, was the leader of a robbery gang.
RAB-1 Assistant Director M Mahfuzur Rahman said a team of RAB-1 conducted a special in Dakshinkhan area of the capital on Saturday night and arrested her.
On June 6, a gang of robbers posing as RAB officials abducted three officials of the ‘Selvo Chemical Industries Limited' in Sreepur, Gazipur, at the gunpoint and swindled Tk 19.45 lakh.
A case was filed with Sreepur Police Station in this regard the next day. Five members of this gang were arrested on June 12.
The RAB official said during preliminary interrogation, the arrestee confessed her involvement with this robbery. She has also admitted that she had been working with the organised bandit group for a long time, the official added.
The arrestee has been handed over to Sreepur police, he added.