Updated

A pregnant mother lost her baby amid a shooting in the downtown area of a western Massachusetts city, police said.

In a press release, the Hampden County District Attorney's Office said that an "uninvolved female occupant" seated on a public transportation bus was struck by gunfire near an intersection in Holyoke before 1 p.m. Wednesday afternoon.

Holyoke Police Department deputies

Holyoke Police Department investigate reports of "multiple victims" from an active shooting Wednesday. (Holyoke Police Department)

The unidentified woman and her unborn baby were immediately transported to a local hospital "in critical condition," authorities said. 

Authorities said the baby was delivered and needed life-saving medical services after the incident.

The baby "tragically passed away," the DA's office said. Authorities have not released any details about the mother's health following the shooting.

SHOOTING DURING HOMECOMING FESTIVITES AT BALTIMORE UNIVERSITY LEAVES 5 INJURED

Massachusetts State Police (MSP) said that a preliminary investigation revealed that the shooting stemmed from an "altercation among a group of people." Authorities later said that three men were involved in the altercation. 

Police said that all three suspects are in police custody and that all involved suspects have been identified. Authorities have not released the names of the three suspects.

Holyoke Police Department car

The Holyoke Police Department said that the shooting stemmed from an "altercation among a group of people." (Holyoke Police Department)

The office of Holyoke Mayor Joshua Garcia said the mayor was aware of the shooting.

"Shortly before 1 p.m. today there was a shooting at the intersection of Maple and Sargeant Streets in Holyoke. There were multiple gunshot victims. The police investigation is active and ongoing," the office said.

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Holyoke police have asked residents to avoid the area while officers investigate the scene. 

The Associated Press contributed to this report.