Detective Superintendent Ian Mulcahey , the senior investigating officer, said: "These are serious allegations that will be thoroughly investigated.
"Many have provided graphic accounts of abuse, in some cases of very serious criminality."
More top news
An ejector seat manufacturer is to be prosecuted over the death of Red Arrows pilot Sean Cunningham at RAF Scampton in November 2011.
Police said the "active shooter" had since been shot by officers and they were not seeking any other suspects.
Rain will continue spreading in from the southwest, remaining heavy, especially in western areas.