Flat used for forced prostitution by trafficked girl

The tenant moved in November and has paid rent due in accordance with the AST. I had tried to meet the new tenant at the flat on a couple of occasions after he moved in, but numerous excuses meant this did not happen e.g. he was traveling or meeting relatives away etc.

Last week the police raided the apartment and found a trafficked girl who had been forced into prostitution. The police had to break down the front door so consequently this will have to be replaced including new lock.

The tenant did not leave any of his possessions in the flat with the exception of bedroom furniture used by the trafficked girl. Up until now it has not been possible to contact the tenant and police investigations are ongoing.

My question is what is the best and most expedient way of repossessing the flat and terminating the AST so I can rent to new tenants?

Many thanks

Paul