Brady Richard Polchies is unlawfully at large from the Parrtown Community Correctional Centre in Saint John. (Saint John Police Force)

Saint John police are looking for a federal inmate, who has been unlawfully at large from a halfway house in the city since February.

A warrant of apprehension has been issued for Brady Richard Polchies, 23, who went missing from the Parrtown Community Correctional Centre on Carleton Street on Feb. 18.

He is serving a federal sentence of four years and four months for robbery, fail to comply with a probation order and being unlawfully at large, Sgt. Jay Henderson stated in a release on Wednesday.

It's unclear why the public was only notified of Polchies' disappearance after six weeks.

The circumstances surrounding his disappearance have not been released.

Police have reason to believe Polchies is in the Kingsclear First Nation area, where his family lives.

But he could have associates in the Oromocto, Fredericton and Woodstock areas, Henderson said in the statement.

When Polchies was previously unlawfully at large, he was apprehended in Saint John, Henderson said.

"So it is possible that he could be in the city on occasion."

Polchies is described as being six feet one inch tall, about 200 pounds, with black hair, brown eyes and numerous tattoos on his arms, hands and face.

He was last seen wearing jeans and light brown Timberland work-style boots.

Polchies often wears ball caps and may be wearing a white and blue patterned jacket with a hood, said Henderson.