UPDATE as of 8:12 a.m.: All northbound SR 509 lanes are now open.
INITIAL POST: All northbound lanes of state Route 509 near Port of Tacoma Road are blocked after a 3-car crash, according to the Department of Transportation.
The accident happened about 7:40 a.m.
A school bus was stopped in front of railroad tracks with a van behind it when a pickup truck plowed into the back of the van, pushing it into the school bus, trooper Guy Gill said.
No children were on board at the time and no major injuries were reported.
WSDOT reports all traffic is being routed onto Port of Tacoma Road.