Fatal motorcycle crash shuts down EB 91 Freeway in Riverside, creating massive traffic backup

RIVERSIDE, Calif. (KABC) -- The eastbound 91 Freeway was completely shut down in Riverside Thursday morning following a fatal crash involving a motorcycle.

The crash happened around 5 a.m. at Magnolia Avenue, according to the California Highway Patrol.

Details about what led up to the crash were not immediately disclosed, but AIR7 HD was over the scene where a vehicle could be seen in an embankment just off freeway lanes.

The freeway closure created a massive traffic back-up for morning commuters as they were being diverted off the freeway at Pierce Street.

It's unknown when eastbound lanes would reopen.

DEVELOPING: We will add more details to this report as they become available.