An armed man has taken two members of staff hostage inside a bowling alley at a Nuneaton leisure complex, its chief executive has said
Mehdi Amshar said the hostages were being held at MFA Bowl, in Bermuda Park, which also includes a cinema, a children's play centre and a gym.
One eyewitness said a man with a gun had shouted at him to "get out".
Warwickshire Police said the ongoing incident was unconnected to terrorism. There have been no casualties.
West Midlands Ambulance Service said it had been called to the leisure complex at 15:40 BST.
MFA Bowl chief executive Mr Amshar said: "We understand that there is a gunman in the place and he is holding two of our staff as hostage."
He said he understood the man was known to a member of staff at the bowling alley.
Staff realised two members of staff were missing when a headcount was completed after an evacuation, he added.
Everyone else had been accounted for and police officers were now negotiating with the man, Mr Amshar said.
The gunman has been described by eyewitnesses as "in his 40s" and carrying a gun "slung" over his shoulder.
Chris Turner told the BBC he saw the man "ran up to the door of the bowling alley with a gun in his hand" and told him to "get out".
He said the man also shouted at a crowd of people outside to leave, saying: "I've already told you once."
Earlier, Kelly Perrett, who was at the Frankie and Benny's restaurant, told the BBC: "I am hiding in the toilet with about 20 people.
"It looks like police have got the bowling alley surrounded. The police told me that the gunman is near the door with a hostage."
Megan Westward said she was about to leave a children's soft play centre when staff told her to move away from the windows.
"There are quite a few bullet proof vans," she said. "We've just seen an air ambulance take off, there are ambulances and there are police in full body suits with guns."
She was then evacuated to a nearby hotel.
The ambulance service said it had "a number of resources" at the scene, including a hazardous area response team and an emergency planner.
An air ambulance was initially dispatched to the scene but has now left.