SAN DIEGO -- San Diego police are investigating the deaths of a woman and her 2-year-old son Saturday after they fell from the third level of Petco Park, just as thousands of baseball fans were heading inside for a Padres game, the San Diego Union-Tribune reported.

The woman, 40, and the boy were pronounced dead at 4:11 p.m., about 20 minutes after police were alerted to the incident, Lt. Andra Brown told the newspaper.

The pair fell from the third level concourse -- the equivalent of six stories high -- to the sidewalk below on Tony Gwynn Drive, Brown said.

Their names were not released; both lived in San Diego. The mother and child had been at a dining/concession area on the concourse level prior to the fall, Lt. Adam T. Sharki said. The child's father was at the ballpark when the deaths occurred, police reported.

"We are aware of the incident on Tony Gwynn Dr. and first responders are on scene," Padres vice president of communications Craig Hughner said in a statement. "Due to the ongoing investigation, we are not able to comment further at this time. All media inquiries should be directed to SDPD."

Police told the Union-Tribune it is too early to know whether the fall was accidental or intentional, but noted that the victims' deaths "appeared to be suspicious.''

Brown said investigators understand that there may have been a number of people in the concourse area who might have more information, which, she said, could potentially "give the family some peace.''

The Associated Press contributed to this report.