Queensway Tunnel has been closed due to an ongoing police incident.
The tunnel is currently closed from Liverpool to Birkenhead as officers work at the scene.
It is not clear at this stage what the police incident is, but the ECHO have approached Merseyside Police for further information.
Diversions are currently in place.
Mersey Travel said: "The Birkenhead tunnel is currently closed due to a police incident.
"All traffic is currently diverted through the Wallasey tunnel. We will keep you updated as to when it reopens."
For the latest news and breaking news visit http://www.liverpoolecho.co.uk/news/.
Get all the big headlines, pictures, analysis, opinion and video on the stories that matter to you.
Follow us on Twitter @LivECHONews – the official Liverpool ECHO Twitter account – real news in real time.
We're also on Facebook/theliverpoolecho – your must-see news, features, videos and pictures throughout the day from the Liverpool ECHO.
All traffic diverted to Wallasey Tunnel