The incident occurred at the Police Training College in Jharoda Kalan on July 22 and a departmental inquiry has been initiated against the constable, who is in his 30s, he said
He also "inappropriately" touched two of his women colleagues in the mess, the officer said.
Later, some women personnel saw him "masturbating and bathing in the rain without clothes" on the terrace in front of the barracks that house female personnel, he said.
The allegations against him are being probed. The constable works as a driver at the training college, police said.