Rapid Action Battalion (Rab), however, took constable Anwar Hossain in their custody from the Kotwali Police Station in a few hours of the incident, sources said.

Rab officials denied Anwar's involvement with any questionable act, saying whole episode occurred due to 'misinformation.'

Acting on a tip-off, the joint DB and Kotwali police team raided the residence of one Matlab Sowdagar at Askerdighir Par at around 12.30am on Wednesday and detained Anwar along with two women. Anwar identified him as a constable of Rab-7.

Police then informed the matter to the Rab officials.

Wife of Matlab Sowdagar told journalists that a team of Rab took Anwar to their custody from her residence at around 1.00am. They also released the two women, asking them to contact Rab office by 10.00am.

"The two women rented the house just two months ago. Anwar used to come here in the night. The local people also knew him as member of Rab," said Matlab's wife.

But, the on-duty officer of Kotwali PS said Anwar was brought to the thana and Rab took him from there. No diary or case was filed in this connection, he said.

Rab officials said police detained Anwar on misinformation. Anwar actually went there to visit his relative, they added. The officials refused to say anything more about the matter.

The two women went missing since the incident.