When he was asked whether they had potentially plunged to their deaths, he said he had no way of knowing that.
The office of Suffolk County District Attorney Rachel Rollins is leading the investigation.
"For a parent to come to a place in which they harm their children in this way indicates that their mental health struggles were severe", Rollins said.
"This disgusting situation highlights the invisible struggles many members of our community confront and the devastation that can result", Rollins said.
"The evidence collected thus far suggests that these deaths which occurred between approximately 1:25 p.m. and 1:35 p.m. yesterday were very likely a double murder-suicide", Rollins said.
Pascal and her children were taken to an area hospital Wednesday afternoon, where they were pronounced dead. "It was terrible. There were children's shoes and the mother's shoe".
"In closing, I want to say that every death in our community, whether homicide or suicide, has significant impacts, it can leave people in despair, traumatized, and feeling hopeless", she added later during the press conference. She noted that this time of year can be "challenging and difficult" for some.
"As a mother, it was incredibly hard, this scene in particular, where there were two young children that lost their lives today", Rollins said Wednesday.
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"On any day if it had happened, it would have been a tragedy, " she said during the WBUR interview.
"It's really a devastating loss for all of us, " she said.
"It's a tragedy", Boston Police Commissioner William Gross told reporters Wednesday.
Witnesses who may need help can contact the department's Trauma Response Team at 617-431-0125.
The victims' vehicle was found at the parking structure, with one child seat facing forward and the other backward, Rollins had told a news conference on Wednesday.
Northeastern University this fall put additional security measures in three parking facilities on campus, including at the Renaissance Park garage, university spokeswoman Renata Nyul said.
Aerial footage of the scene, which was aired by local television stations showed investigators gathered around the vehicle on the top of the building. A second death occurred on December 9.