The state Department of Children and Families has cleared three Andover High School varsity boys’ hockey coaches of wrongdoing, concluding a probe into allegations of mistreatment of players, and the school’s principal immediately reinstated them Friday.

“I have, as of this afternoon, been notified . . . that the agency has found that all of the allegations were unsupported,” said Philip Conrad, Andover High School principal, in a statement.

Andrea Grossman, a DCF spokeswoman, confirmed to the Globe that the agency “has completed its investigation of this matter.”