'This Is A Tragedy': 2 Children, Woman Dead After Incident By Boston Parking Garage

BOSTON (CBS) -- A woman and two children are dead following an incident at a Northeastern University parking garage on Christmas Day. An active police investigation is underway.

Police responded just before 1:30 p.m. Wednesday to the Renaissance Park Garage, where they found the woman and children unconscious on a sidewalk. They were pronounced dead at a nearby hospital.

"At this point, this is a death investigation," Boston Police Commissioner William Gross said at a news conference.

Gross said he spoke with Boston Mayor Marty Walsh, and he was upset by the incident.

"This is a tragedy," Gross said.

Police are still in the process of identifying the woman and two children. The children are believed to be under 5 years old based on car seats found in a car on top of the garage. The car was towed away by police for investigation Wednesday evening.

Gross said he would not rush to conclusions about the cause of the deaths. Police have not specified the relationship between the woman and the children.

Suffolk County District Attorney Rachael Rollins is leading the investigation.

"On Christmas and the holiday season where many people are celebrating, it can be a challenging and difficult time," she said. "I feel it imperative that we let people know that there is help."

She said anyone who needs help can call the Samaritans statewide hotline (877) 870-4673

Rollins confirmed that this is the same parking garage from which Boston College student Alexander Urtula jumped to his death back in May.

Anyone with information is asked to contact police.