An unidentified gunman opened fire into traffic on a roadway near Memorial Drive in Cambridge, Massachusetts, on Monday afternoon [1].

The incident caused immediate chaos in a high-traffic area, raising concerns about public safety and the use of high-powered weaponry in urban centers.

According to reports, the shooter used a semi-automatic rifle to fire into vehicles [2]. The gunman appeared to be firing at random, and authorities have not yet established a motive for the attack [3].

There are conflicting reports regarding the number of casualties. One report said that at least one person was wounded [4]. Another report said that two people were shot and suffered life-threatening injuries [5]. Local emergency services responded to the scene to provide medical aid to the victims.

Police have not released the identity of the gunman. Law enforcement officials continued to investigate the scene on Monday to determine the sequence of events and search for the suspect. The area near Memorial Drive remained under police scrutiny as investigators sought further evidence from witnesses and surveillance footage [1].

Cambridge officials have not provided further updates on the condition of the injured parties or the status of the suspect's capture [4].

The gunman opened fire with a semi‑automatic rifle into traffic

This event highlights the volatility of random acts of violence in densely populated areas and the significant danger posed by semi-automatic rifles in public spaces. The discrepancy in casualty reports underscores the typical confusion during the early stages of active shooter investigations.