In a gunfire incident like many from the past year, police have recovered a shell casing but no victims after responding to reports of shots fired in The Port neighborhood at around 9:45 p.m.

ShotSpotter technology detected a possible shot fired, drawing police to School and Pine streets, where the area was canvassed and the shell casing found on Pine Street. “Fortunately, there are no known injuries or victims,” police said in an email.

A witness reported seeing a black sedan drive down School Street toward Windsor Street after what they also believed was a gunshot, police said. Detectives are looking for video surveillance footage and for more witnesses.

Before the Monday report of gunfire, the most recent of more than a dozen incidents this year involving firearms was just four nights earlier, when a “moving gun battle” between two cars headed toward Central Square resulted in one nonfatal injuries and two arrests. 

But most have been like this one: in or around The Port, with no known victims.

City councillors asked police June 18 to assemble a task force to address the spate of gunfire incidents. The task force cut reports of shots fired by 78 percent from its start June 19 to its disbanding Sept. 1, along with making 46 arrests and issuing more than 200 warnings for illegal behaviors such as drug possession, causing “significant disruption to drug markets,” the City Council learned in September.

Anyone with information is asked to call Cambridge Police at (617) 349-3300. Anonymous reports can be left at (617) 349-3359; sent by text message to 847411 (begin your text with TIP650, then type your message); or by email by visiting CambridgePolice.org/Tips.