Boston Celtics guard Terrence Williams was arrested Sunday and accused of brandishing a gun at the mother of his 10-year-old son during a visitation exchange, police in Kent, Wash., said.

A judge has set bail at $25,000 for Williams, who was booked into the King County Jail in Seattle early Monday for investigation of assault. Bail was set during an afternoon court appearance, and the judge scheduled another hearing for Wednesday.

According to a police report, the 25-year-old Williams went to the woman's apartment complex in the suburb of Kent to drop the boy off Sunday afternoon and displayed a gun during an argument. The report says Williams denied pointing the gun at anyone and told police he showed it because he felt threatened by the woman and her boyfriend.

"A Million Stories Not One Thats TRUE.....," Williams tweeted Monday night after posting bail. "Thanks To Those That Continue To Support Through Devil Testing Times...Those Thats Negative..THANKS"

Williams signed a 10-day contract with the Celtics in late February, then later agreed to a multiyear contract. He appeared in 24 regular-season games, averaging 4.6 points, 1.8 rebounds and 1.6 assists over 13.3 minutes per contest.

Williams, the 11th overall pick of the New Jersey Nets in the 2009 draft, has played for four teams in four NBA seasons and admitted that his own immaturity played a role in his trouble sticking with a team. He played for the Guangdong Southern Tigers of the Chinese Basketball Association at the start of the 2012-13 season before joining Boston upon returning stateside.

The 6-foot-6, 220-pound Williams found a role as a backup point guard with the Celtics and appeared in five of the team's six postseason games against the Knicks, logging a playoff-high 17 minutes in a Game 5 victory in New York.

Williams is scheduled to earn $948,000 if he makes the Celtics' roster next season. His contract is initially fully non-guaranteed but has checkpoints that unlock portions of his salary. The Celtics have until June 30 before $200,000 of Williams' contract becomes guaranteed (jumping to $300,000 on Sept. 1, and becoming fully guaranteed on Oct. 31 near the start of the 2013-14 season).

Information from The Associated Press and ESPN Boston's Chris Forsberg was used in this report.