A two-vehicle rollover on northbound Interstate 5 just south of Interstate 90 in Seattle is being treated as a vehicular assault, according to state Trooper Rick Johnson.

The driver who allegedly caused the crash is in custody for DUI while detectives continue their investigation. 

The vehicles were rolled over on both sides of the freeway. 

The three left lanes were open by 12:30 p.m. All lanes opened before 1 p.m.