Warwickshire Police have confirmed they are dealing with an 'ongoing incident' at Bermuda Park, and called for people to steer clear.
Witnesses have claimed that man is armed with a sawn-off shotgun.
One man has tweeted: "Odeon Cinema in Nuneaton, Warwickshire on lockdown man inside has taken hostages. Police have closed the area."
According to eye-witness Dean Rogers, access to the site has been blocked by police and there are up to 30 armed officers at the scene.
All roads into Bermuda Park have been blocked by police, according to reports on Twitter.