Several vehicles were damaged Friday when concrete debris fell from the ceiling of a Boston tunnel, resulting in considerable traffic backups.

Concrete debris fell from the Prudential Tunnel in Boston Friday afternoon, hitting several vehicles. State Police said the debris fell into the left and middle travel lanes in the tunnel on the westbound side of the Mass Pike. All traffic on the westbound side of the Mass Pike is being diverted while the debris is removed.

State highway officials are conducting emergency inspections of the Prudential Tunnel in Boston after chunks of concrete fell onto the roadway Friday afternoon.