Dr David Kirrage from Public Health England says the risk that any child has caught an infection is "negligible", and they and Moreton School in Wolverhampton are working to reassure parents, after 20 pupils were jabbed with a diabetic testing needle.
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A gunman who held two members of staff hostage at a bowling alley in Nuneaton has been arrested.
There are reports of flash-bangs being used at Bermuda Park as ambulances arrive at the scene.
Chris Turner, an eyewitness to the incident at Bermuda Park, said a man was carrying a shotgun and told him to "get out of the way".