Detective Branch (DB) of Police on Friday arrested a BNP activist along with foreign pistol from Ramsingh area in Sadar upazila here.
The arrestee is identified as Rasel Munshi, 27.
The detained BNP activist is now undergoing treatment at Munshiganj General Hospital.
He will be sent to jail through court on Saturday.
Belal Hossain, sub-inspector of Munshiganj DB police said acting on a tip off, a team of police raided the area and arrested Rasel Munshi.
Police also recovered a foreign pistol from his possession.
The SI also said Rasel Munshi fell into a nearby pond while trying to flee.
Later, police recovered him and brought him to the hospital.
A case was filed against him.