Boston ? Boston police are investigating a fight between two Yankees and a Fenway Park worker who was cheering for the Red Sox in the New York bullpen during the AL championship series Saturday night.

Police spokeswoman Mariellen Burns said assault charges could be filed against the two players, but she backed off earlier police statements that charges will be filed.

“Summons may be issued,” she said, “but we’re looking for more detailed information before that happens.”

Red Sox spokesman Charles Steinberg said Paul Williams, who works for the grounds crew, contended Jeff Nelson and Karim Garcia attacked him.

“The Red Sox are terribly concerned and distressed about the attack on our employee tonight,” he said.

The Yankees denied the players were to blame.

“A security incident like this would never be tolerated at Yankee Stadium,” president Randy Levine told the Associated Press. “Unfortunately, there was an atmosphere of lawlessness that was allowed to be perpetrated all day long. The events of the entire day were disgraceful and shameful, and if it happened at our ballpark, we would apologize, and that’s what the Red Sox should do here.”

With tempers already high following a bench-clearing melee earlier in the game, Nelson was annoyed that Williams was cheering for the Red Sox while he was in the New York bullpen, and he told Williams so.

“He was standing in our bullpen waving the rally flag,” the reliever said, following New York’s 4-3 win over the Sox in Game 3 of the AL championship series. “I told him, ‘If you’re rooting for the Red Sox, why don’t you go in their bullpen.’ He jumped in my face and tried to take a swing at me.”

Williams acknowledged pumping his fist twice while holding a white towel after the Red Sox turned a double play in the ninth inning, Steinberg said.

“If that was in poor taste, or poor judgment, it certainly didn’t warrant a beating,” Steinberg said.

Williams had cleat marks on his back and his arm, and he may have been kicked in the mouth, Steinberg said.