A police officer has opened fire at a police station in Puerto Rico, killing three fellow officers, officials say. The shooter has been taken into custody but the circumstances of the killings were not immediately known. Puerto Rico Police said the shooting happened on Monday morning at the regional police headquarters in Ponce, a city on the island's southern coast. Those killed were a police commander, a lieutenant, and an officer. Their names were not immediately released, but the El Nuevo Día newspaper identified those killed as 49-year-old Commander Frank Román, 49-year-old Lieutenant Luz M. Soto, and 42-year-old officer Rosario Hernández de Hoyo. The suspect, a 50-year-old officer with 9 years of service, was taken to an area hospital for treatment and is in police custody.

James Valles reporting