SAN MATEO (CBS SF) — A 19-year-old San Mateo man was arrested on suspicion of rape, domestic battery and criminal threats after he allegedly attacked his ex-girlfriend Thursday, the San Mateo County Sheriff’s Office said.

Jose Armenta Lopez allegedly strangled and sexually assaulted his ex-girlfriend after they had argued and she reported the incident to local police after the suspect dropped her off.

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Deputies investigated and arrested Lopez at his job, booking him into San Mateo County jail.

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Detectives believe the attack is an isolated incident.

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The investigation is ongoing and anyone with information about the suspect is asked to contact Detective Jerri Cosens (650) 363-4347 or