Three-year-old fraternal twins died in the pre-dawn hours of Friday morning after they were found unresponsive in a car on Interstate 95 in north Miami-Dade County, shortly after the woman driving the car attempted to kill herself, police said.

About 2 a.m., police received a 911 call from a passerby about an unresponsive child, followed by another call reporting a second unconscious child, police said. “One person is performing CPR on one child,” a dispatcher told Miami-Dade Fire Rescue paramedics via radio.

When officers arrived at the northbound exit to Florida’s Turnpike extension, the woman who had been driving the vehicle was out of the car and then “went over the railing of the on-ramp,” landing on the Tri-Rail tracks, which run under the Golden Glades interchange, Det. Andre Martin, a police spokesman, told reporters near the scene.

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