"There are no circumstances in which it is acceptable for a player to confront an opponent after a game," Jackson said in a statement. "Carmelo Anthony attempted to engage with Kevin Garnett multiple times after Monday's game and therefore a suspension was warranted."
Anthony will miss the Knicks' game at Indiana on Thursday and lose about $176,700 of his $19.4 million salary.
Jackson said Anthony confronted Garnett "in the arena tunnel, near the players' locker rooms, and in the parking garage." The incident by the bus, with New York police and Knicks coach Mike Woodson nearby, was captured on videotape.
Anthony and Garnett received technical fouls with 9:03 remaining in the Celtics' 102-96 victory, arguing with each other from the baseline to midcourt after a physical exchange on Boston's previous possession. After the game, Anthony went the wrong direction toward the Celtics' locker room in hopes of finding Garnett.
On Tuesday, Anthony said he was upset because of what Garnett said, though wouldn't elaborate on what it was.
Anthony said they eventually spoke and settled the matter.
Minnesota All-Star Kevin Love will miss 8 to 10 weeks after needing surgery to repair a right hand that is broken for the second time this season.
* Investor Chris Hansen has contacted the Maloof family about buying the Sacramento Kings, setting up the possibility of the NBA's return to Seattle.
In games last night *
At Boston, Jeff Green scored 14 points, rookie Jared Sullinger added 12 and a career-best 16 rebounds, and the Celtics held off Phoenix, 87-79.
* At Charlotte, Al Jefferson had 26 points and eight rebounds, and the Utah Jazz beat the Bobcats, 112-102.
* At Cleveland, Kyrie Irving scored 33 points as the injury-riddled Cavaliers beat the Atlanta Hawks, 99-83.
Cavs center Anderson Varejao will have surgery Thursday to repair a muscle near his right knee. He will miss 6-8 weeks.
* At Chicago, Brandon Jennings scored 35 points as Milwaukee beat the Bulls, 104-96.
* At Oklahoma City, Kevin Durant scored 26 points, Russell Westbrook had 23 and the Thunder beat Minnesota, 106-84.
* At San Antonio, Tony Parker's 24 points led the Spurs past the Los Angeles Lakers, 108-105.
* At New Orleans, Roger Mason's 15 points in the fourth quarter rallied the Hornets to an 88-79 victory over Houston.
* At Denver, Kenneth Faried had 19 rebounds and 19 points as the Nuggets beat Orlando, 108-105.