SAN JUAN, Puerto Rico—Two paramedics in Puerto Rico have been charged with first-degree murder in the killing of a competitor from another private ambulance company whom they felt stole a patient.

A Justice Department statement Friday says the two men also face previous weapons violation charges in unrelated cases.

The two are accused of fatally shooting 31-year-old Luis Deida Martinez on Wednesday while he ate breakfast at a local bakery in the northern coastal town of Arecibo. Police said the attackers drove away in an ambulance.

Police say the victim had apparently argued with the two suspects a day earlier after his wife picked up a patient that they claimed should have been transported by them.