The Queensway Tunnel in Merseyside is closed after a serious crash involving an off-road bike, police have said.
Merseyside Police said it was contacted at 13:05 BST with reports of a one-vehicle collision on the Birkenhead-bound carriageway.
Motorists are being urged to avoid the area while police deal with the incident.
Merseytravel said all river-crossing bus services will face delays and will be re-routed via the Kingsway Tunnel until further notice.
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