Emergency Eviction??

Had a few issues with my current tenant (Mr X), but it has all kicked off tonight. The other tenant nextdoor tells me the Police have been called to flat as Mr X kicked off and threatening to kill himself after a drink and drugs combo mixed with existing meds he has to take for medical issues. Has just been arrested apparently under the Mental Heath Act (and after going for the woman PC) and taken away – I assume to a local secure facility.

The neighbour informs me before door to flat was slammed shut by Police it has been trashed with blood etc all over the carpet and syringes everywhere.

What do I do next? Assume an urgent call to the Council tomorrow to let them know the situation and the fact he clearly can’t return?

Can I change the locks now to stop him going back in but post something on the door to tell him I will grant him access to take his stuff if he contacts me??

Reluctant Landlord