A 911 call at about 3:38 p.m. Friday reported a child inside a van at the PATCO High Speed Line, according to a press release from the Camden County Prosecutor's Office. Police arrived and found the girl unresponsive in her car seat and the passenger window broken, authorities said.
The toddler was pronounced dead on the scene at 3:54 p.m. The investigation is ongoing and no charges have been filed at this time, the prosecutor's office said.
Lindenwold is a suburb about 15 miles southeast of Philadelphia.
Last year was the deadliest year for child vehicular heatstroke in 20 years, with 52 children between 7 weeks and 5 years old dying after being left in cars.