Man hiding under a delivery truck in SF is run over

File photo of generic hospital emergency room. Close up of sign for emergency department in hospital File photo of generic hospital emergency room. Close up of sign for emergency department in hospital Photo: ERproductions Ltd / Getty Image Photo: ERproductions Ltd / Getty Image Image 1 of / 1 Caption Close Man hiding under a delivery truck in SF is run over 1 / 1 Back to Gallery

A 28-year-old man suffered life-threatening injuries Tuesday when a parked delivery truck he was hiding under in the South of Market neighborhood of San Francisco started up and ran him over, officials said.

The incident occurred at about 2:15 p.m. on the 400 block of Jessie Street near Mint Plaza and Westfield San Francisco Centre, police said.

Witnesses told police that the victim climbed underneath the truck to hide for unknown reasons. The driver returned to his truck and, unaware that a person was under the vehicle, started it up and ran the man over, police said.

“We don’t know the reason why he was underneath the vehicle. The victim who was struck didn’t share that information,” said Officer Robert Rueca of the San Francisco Police Department.

The driver cooperated with the investigation and no arrests were made, police said.

The victim was transported to a hospital with life-threatening injuries.

Sarah Ravani is a San Francisco Chronicle staff writer. Email: sravani@sfchronicle.com Twitter: @SarRavani