Young twins died after being found unresponsive in a car parked along Interstate 95 in Miami early Friday and the female driver was critically injured when she jumped off an overpass when police arrived, authorities said.
NBC Miami described the victims as a boy and a girl who were fraternal twins between the ages of three and four.
The investigation had traffic tied up north of Downtown Miami and was delaying commuter trains.
Miami-Dade County Police said 911 calls were received at about 2 a.m. about the boy and girl, who were in the back seat of a car parked on the Golden Glades Interchange where I-95 meets Florida?s Turnpike. It is one of South Florida?s busiest traffic spots.
Passersby were attempting CPR.
When officers and fire-rescue arrived, the woman jumped off the overpass onto train tracks well below, "which is a considerable distance," Detective Andre Martin told reporters.