MORTISTOWN — Both lanes of Interstate 70 west in Belmont County are closed Tuesfay afternoon due to a semi crash near Exit 208 near the rest areas. Traffic is backed up for at least two miles. Motorists are getting off the interstate at Exits 213 and 215 and traveling west on U.S. 50. The Ohio State Highway Patrol said no injuries had been reported. The Belmont Volunteer Fire Department is also on scene.