Police-Line-Tape-Do-Not-Cross-psd6657.pngA pedestrian who was struck by a pickup truck in San Francisco’s South of Market District this morning has been pronounced dead at a local hospital, a police sergeant said.

A big-rig that was traveling eastbound on King Street collided with a white pickup truck that was headed southbound on Fourth Street at around 5 a.m., police Sgt. Wilfred Williams said.

The two vehicles collided at Fourth and King streets, disrupting traffic and commuter trains.

During the collision, the pickup was hit toward the rear by the big-rig, causing it to spin out of control. The pickup then struck the pedestrian, Williams said. The pedestrian was transported to a hospital and pronounced dead.

The man who was driving the pickup truck has been detained, he said. It was not known whether alcohol was a factor in the crash.

King Street remained closed at around 7:40 a.m. while investigators continued to try to determine what caused the collision just outside a Caltrain terminal station.

Some San Francisco Municipal Railway light rail service also has been disrupted due to the crash, spokeswoman Kristin Holland said.

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