Mariners general manager Jack Zduriencik confirmed on Tuesday night that Bradley had been arrested, but he declined to comment on any specifics of the case.
"After reaching Milton Bradley's representatives tonight, I was able to confirm that Milton had been arrested, and subsequently released, in Los Angeles," Zduriencik said in a statement. "While we do not yet have full details on what occurred, we are aware of the situation and take it very seriously. We are in the process of determining the full circumstances of what occurred today. Until we have more information, we will not be able to comment further."
Bradley was taken into custody about 10 a.m. PT and booked on suspicion of making criminal threats, according to the Times, then released after posting $50,000 bail. He has a Feb. 8 arraignment in Van Nuys Municipal Court.
Bradley, 32, played in 73 games for the Mariners last year after being acquired by trade from the Chicago Cubs. He sat out 14 days in May while being placed on the Major League restricted list while receiving counseling upon leaving the team during a game.
Bradley returned for six weeks before going on the disabled list on July 31, then sat out the remainder of the season following arthroscopic surgery on his right knee.
Bradley hit .205 with eight home runs and 29 RBIs in 244 at-bats. He has one year remaining on his contract and is due to make $12 million this coming season.