An Islington police officer branded a “nasty schoolyard bully” has been sacked for posting offensive comments on Facebook about a fellow officer and harassing another female colleague.

The 35-year-old called a police officer a “grass” and a “liar” during postings ruled unacceptable by the Independent Police Complaints Commission (IPCC).

The officer was also involved in a short casual relationship with a colleague which ended badly, in April last year.

She was then bombarded with abusive text messages by him, including threats.

In a statement, the IPCC detailed an incident involving the same woman in public.

“On one occasion, when both officers were off-duty, a member of the public was so concerned about the male officer’s behaviour that he followed them off a bus and intervened when he saw the male officer smashing up a bin in the street.

“The male officer then verbally threatened the member of the public.”

Both cases were investigated by the Met Police’s professional standards directorate under the management of the IPCC.

No criminal charges have been brought by the Crown Prosecution Service against the policeman, who has been dismissed without notice.

Describing herself “dismayed” by the officer’s conduct, IPCC commissioner Rachel Cerfontyne said: “He worked in a job that demanded trust and respect and yet acted in a way that resembled a nasty schoolyard bully. I am pleased that the Met’s misconduct panel clearly shared our view that this sort of person does not belong in the police service.

“When I read what shocking things this police officer had written on Facebook about his colleague and the appalling way he had behaved, I felt completely dismayed.”

The Met have not named the individual because of ongoing disciplinary proceedings.