Two children and a woman died after being found unconscious outside of the Renaissance Park Garage in Boston on Christmas day.

Boston Police, Transit Police, and Northeastern Police responded to the garage, owned by the Northeastern University at around 1:26 p.m., where they found three unconscious people on the sidewalk.

The female and the two children, who were believed to be under the age of five were taken to the nearby hospital where they were pronounced dead.

The cause and manner of death are not yet known and will be determined by the medical examiner’s office.

“Today is a tragedy,” Boston Police Commissioner William Gross said during an afternoon news conference.

The identities of the victims and their relation to each other are yet to be determined by the police and they are working to notify the next of kin.

TV stations showed police examining an SUV parked on top of the parking garage. Several doors of the SUV were wide open and there were two child car seats in the vehicle, ABC News reported.

The police are currently considering the investigation to be a “death investigation.”

District Attorney Rachael Rollins will head the investigation, with assistance from Boston Police, Boston Transit Police, and Northeastern University Police.

“As a mother, it was incredibly hard, this scene in particular, where there were two young children that lost their lives today,” ABC News quoted Rollins. “We're going to do everything that we can to get the answers.”

The incident took place at the same garage where a Boston college student had leaped to his death earlier this year.

crime scene
Representational image Getty Images/Jonathan Alcorn