Both directions of State Route 18 are closed through Tiger Mountain following a deadly semi crash.

WSDOT says eastbound traffic is being stopped at Issaquah-Hobart Rd and westbound traffic at I-90.

Eastside Fire responded to the scene just before 5 p.m. The crash involves one car and one semi vehicle according to their Twitter account.

SR 18 could be closed for the entire evening commute.