Updated

Washington state troopers say one person was stabbed to death and at least three others were injured in an incident on Interstate 5 Wednesday afternoon. 

Trooper Rick Johnson said troopers responded to the northbound lanes of I-5 in Federal Way, Washington.

I-5-near-Federal-Way

An incident on I-5 in Washington state left one person dead and three others hospitalized. (FOX 13/WSDOT)

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The incident involved four individuals in a black BMW. A male driver was killed from a stab wound, Johnson said. Another male was transported with "multiple gunshot wounds." 

Two others, a male and a female, were transported to area hospitals with stab wounds. 

The Washington State Department (WSDOT) said the two right lanes on the off-ramp to the Seatac rest area were blocked and advised drivers to expect delays. 

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This is a developing story. Check back for updates.