HANNIBAL, Mo. -- Our news-gathering partners at WGEM are reporting that the Mark Twain Memorial Bridge on Interstate 72 that leads into Hannibal is shut down after someone called in a bomb threat to dispatchers at the Marion County 911 Center.
WGEM reports that Marion County Sheriff Jimmy Shinn said the call came in at 8:45 p.m. and the caller said there was a bomb on the bridge that would detonate in an hour.
Traffic has been shutdown on the Mark Twain Bridge while investigators from Illinois and Missouri begin a search for a device, which hasn't been found, Shinn told WGEM.
Sgt. Eric Brown with the Missouri State Highway Patrol said a patrol boat is on the Mississippi River as investigators search underneath the bridge for any possible explosive devices. Bomb technicians and K-9 crews with the Illinois State Police also have been called in to investigate.
Shinn told WGEM that the bridge could be closed for several hours, and he encouraged drivers to cross at Quincy or Louisiana, Mo.