(CBS) — A Chicago Police officer was taken to a hospital Monday morning after a noisemaker firework went off indoors at a Northwest Side police station.

Police say that about 6 a.m., the male officer was in the rest room at the 17th District station, in the 4600 block of North Pulaski, when a noisemaker-type firework went off, Chicago police news affairs says.

READ MORE: Police Warn Of Retail Thefts in Gold Coast

It’s a novelty firework sometimes called a bang snap.

Police say there was no damage to the rest room. The officer was taken to Swedish Covenant Hospital in good condition.

An internal affairs investigation is under way, police spokesperson Anthony Guglielmi tells CBS 2.

READ MORE: Police Surround Apartment Of Barricaded Subject In Villa Park

It’s the second incident in the span of two days in which a Chicago police officer was harmed by a firework.

On Sunday afternoon, someone threw an “M-series” firecracker at a police squad car in the South Shore neighborhood. Although the device exploded outside the vehicle, the two officers inside had concussive-type injuries. They were treated and released Sunday at Northwestern Memorial Hospital; the squad car was rendered inoperable.

“This is a pyrotechnic device, an M-series device that, had it landed in the car, could have caused some very severe injuries to these officers” Chicago Police Department First Deputy John Escalante said of the Sunday incident.


MORE NEWS: Missing Bensenville Dog Reunited With Owners