A chain reaction wreck that began with a car running a red light ended with a CTA bus plowing into a Far South Side currency exchange and four people being injured, Chicago police said.

It happened about 6 p.m. Friday when a Nissan Maxima ran a red light and hit a CTA bus that was northbound on South Michigan Avenue near East 111th Street, officials said.

The bus driver then lost control and crashed into the 111th and Michigan Currency Exchange, said Chicago fire Deputy Chief Francisco Velez.

A 48-year-old male passenger of the bus was taken to Roseland Community Hospital in good condition while a 54-year-old male passenger was taken to Advocate Trinity Hospital, also in good condition, police said.

The driver of the bus, a 28-year-old woman, was taken to Little Company of Mary Hospital with minor injuries, police said. The driver of the car, a 20-year-old man, was taken to Advocate Christ Medical Center in Oak Lawn in good condition.

Authorities were still on scene as of 7:30 p.m. and Velez said the city’s Buildings Department had been called in.

Police did not announce any charges or citations as of 8 p.m. Friday.