UPDATE 10:10pm
Seattle Police report on the Seattle Police blotter that "officers spoke with the driver of the semi who said he was unsure of what punctured the tank, but he had been traveling in the direction of the leak. Officers scoured the area and found a raised curb that appeared to have been hit by the truck, tearing a hole in the exposed fuel tank.
Four other vehicle were damaged in collisions related to the fuel spill and many others were trapped in the spilled fuel.

The ramp is closed as crews continue to cleanup, but is expected reopen around midnight.

Original Post
An approximately 80 gallon fuel spill on the eastbound ramp to the West Seattle Freeway at East Marginal Way shut down the ramp, re-routed buses and apparently was responsible in part for a 3 vehicle accident.

Came from a semi trailer from Harbor Island from 11th Ave. SW and a fuel line on the truck broke spilling diesel fuel on the ramp.

SDOT is cleaning up the ramp, but the line ruptured more completely once the truck reached the freeway and it flooded the roadway.

The road was expected to be closed for hours according to SDOT crews on the scene.