A southern Californian woman and her 2 year-old son plunged to their deaths at a baseball game on Sept. 25.

San Diego Police Department is investigating how a mother and her toddler fatally fell off the Petco Park concourse before the Padres game began. Thousands of fans poured into the venue about 3:50 p.m. when the pair suffered the three-storey fall.

Investigators revealed they were near the dining and concession area on the concourse level when they fell to the sidewalk below on Tony Gwynn Drive. They were pronounced dead at the scene 20 minutes after police were alerted to the incident.

A man told the San Diego Union-Tribune that his wife witnessed the fall. The boy seemingly fell first and the mother also fell while trying to rescue him.

Police cannot confirm whether the fall was accidental or intentional. They are treating the deaths as “suspicious.” Homicide detectives are continuing to investigate the case. No identifying information was released at the time of publication.

“Our hearts obviously go out to the family but also to the people who could potentially be traumatized who saw this,” homicide Lt. Andra Brown said according to the paper. “It is a horrible, horrible thing–that is why we are giving it a very serious look.”

Police and stadium staff restricted public access to some parts of the stadium. Many visitors had no idea what happened.

“They were just keeping us away from that area, we thought it was standard protocol but everyone along this side was keeping us out of that area,” Padres fan Brian Howell told NBC New York. “All we heard was that there might have been an unfortunate incident.”

Anyone who witnessed the incident or has information can phone San Diego police at (619) 531-2293 or Crime Stoppers at (888) 580-8477.

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