It appears that one of the bombers involved in this weeks Boston Marathon attack has a connection to an MMA gym in Boston.

Tamerlan Tsarnaev, who was killed in a gun battle with law officers late Thursday night, trained at the Wai Kru gym in Boston, according to a report by FightLine.

Dzhokhar, Tamerlan’s brother, remains at-large as the city of Boston has been placed on shutdown as the search for him continues.

The two are believed to be the ones behind the pair of bombs that went off Monday, causing the death of three at the finish line of the Boston Marathon.