( CNN ) -- An Interstate 5 bridge over the Skagit River in Washington has collapsed , a spokesman for the Washington State Patrol said Thursday . People and cars were in the water . The bridge is located in a rural area , said Trooper Mark Francis , the spokesman . Because of that , he said he did not expect mass causalities or injuries . There were no immediate reports of either . CNN affiliate King 5 News in Seattle broadcast still images of the evening collapse , showing a span of the bridge in the water and crowds nearby . Images included two people sitting atop vehicles in the water . It was not immediately clear what caused the collapse , which happened some 60 miles north of Seattle . The Washington State Department of Transportation will take over the investigation , Francis said . CNN 's AnneClaire Stapleton contributed to this report .
The collapse happened north of Seattle . Comment: It 's not immediately clear what caused the collapse .