Cook County Sheriff’s detectives are looking for a man, Joseph L. Lopez Jr., 34, of Mount Prospect, in connection with an attack on a woman in unincorporated Palatine this week.

Lopez is believed to be armed and dangerous, according to a release from Sherriff Thomas J. Dart. He has threatened to shoot police officers who come in contact with him and harm himself, the release stated.

Authorities obtained an arrest warrant Thursday for Lopez for aggravated domestic violence, the release stated. Lopez is suspected of severely beating a woman late Tuesday inside a car in a parking lot, sheriff’s deputies said.

Dart asks the public not to approach Lopez and asks anyone with information about Lopez’s whereabouts to call 708-865-4896.