At least two people sustained injuries Monday afternoon when a gunman opened fire on passing vehicles along Memorial Drive in Cambridge, Massachusetts, according to authorities and witness reports.

Witnesses described seeing a man with a long gun randomly shooting at cars traveling on the busy roadway near Harvard University. The incident prompted a massive police response as reports of the active shooter situation spread.

Massachusetts State Police confirmed that at least one person was wounded in the shooting. Multiple sources indicate that two individuals suffered life-threatening injuries during the attack.

The suspect, identified as Tyler Brown, allegedly fired between 50 and 60 rounds during the incident before being stopped. Both a Massachusetts State Police trooper and an armed civilian shot the suspect, ending the threat to motorists and pedestrians in the area.

The shooting occurred in broad daylight on Memorial Drive, a major thoroughfare that runs alongside the Charles River and is frequently traveled by commuters and visitors to the Cambridge-Boston area. The incident temporarily disrupted traffic and triggered emergency responses from multiple law enforcement agencies.

Authorities have not released additional details about the victims' conditions or the suspect's motives. The investigation into the shooting remains ongoing.