BOSTON — A third woman has died as a result of injuries from a Boston shooting.

Four women were shot while sitting in a parked car in the city’s Dorchester neighborhood on Sunday night. One died at the scene and another died at Boston Medical Center.

The third woman was confirmed dead Monday afternoon after being in grave condition.

Police have not released the women’s ages or identities, although Assistant District Attorney Mark Lee said none of those involved were children.

Lee told reporters at a noon press conference that there is no indication the shooting was random. Gang ties are a possibility and there was no indication drugs were involved, he said.

Boston police are looking for a white SUV with a black top and halogen lights in connection with the shooting.

A surveillance camera near Harlem Street, one of many cameras installed in crime “hotspots” at the beginning of the summer, captured a photo of the car.

Police are working with experts to identify the make and model of the car, Lee said.

The shooting was one of three that occurred Sunday, two of which were fatal.

“Up until this weekend, we’ve had a relatively uneventful summer,” Police Commissioner Ed Davis said. “That all changed.”

Davis, Lee and Mayor Thomas Menino met Monday morning to discuss the shootings, then briefed reporters at noon.

A shooting early Sunday morning near Hyde Park left one man dead and three injured.

There is “significant ballistic evidence” related to that shooting, Davis said.

Another unrelated shooting in Dorchester Sunday left one person with injuries that aren’t life-threatening.

Menino said the city has increased police presence and violence intervention teams in the areas where the shootings occurred.