Peel Regional Police are investigating after the body of a teenage girl was discovered in Mississauga on Friday, hours after a teenage boy fell onto Highway 401 nearby.

Police said the body was found in a parkette on Spinnaker Circle, near the Courtneypark Drive West and Mavis Road area, at around 12:30 p.m. Two hours earlier, police were investigating after a 16-year-old boy fell onto the eastbound lanes of Highway 401 from the Mavis Road overpass.

Friends of the boy said he and the victim, both Grade 12 students at Mississauga high schools, were friends.

"He was just really tense about how his life was going on, and his friends left him, and he had problems with this family, and he broke up with his girlfriend and everything," Navjot Mann, the victim's friend, told CTV Toronto.

Mann said the boy confided in the teenage girl.

"They were best friends for a long time. They were always together, always at lunch period, they'd always be together."

Police have not said how the body was discovered, except that they received information that brought them to the heavily wooded area behind the park.

A command post was set up in the area and the park was taped off. Police said a second scene nearby a public washroom was also closed off.

Police said the boy in stable condition with serious injuries.

Police have identified the female victim as 17-year-old Kiranjit Nijjar of Mississauga. Charges related to the death of Nijjar are pending against the 16-year-old boy, police said.

The male cannot be identified because of the Youth Criminal Justice Act.

Anyone with information is asked to call Peel Regional Police Communications at 905-453-3311 or the Homicide and Missing Person's Bureau at 905-453-2121 ext. 3205.

With a report from CTV Toronto's Tamara Cherry