One Gaithersburg police officer has been fired and two others were suspended for their involvement in “serious, unrelated allegations of misconduct,” the department announced Wednesday.

Gaithersburg Police Chief Mark P. Sroka declined to discuss the nature of the misconduct allegations or the identities of the officers involved, saying it was an internal matter. He said none of the incidents involved criminal misconduct and all occurred in March. The fired officer had been assigned to administrative duties, while the suspended officers were on the patrol beat.

“One of the most critically important issues that defines the effectiveness of any police agency is its credibility,” Sroka said in a statement. “The actions that were taken demonstrate zero tolerance for actions that undermine the Gaithersburg Police Department’s credibility, and reaffirm our commitment to earn and maintain the public trust.”