I'm worried about my security and safety after 5 police officers came to the house at 4am and arrested a man living in the flat of my upstairs neighbour . Before they took him away i heared them say it was for failing to attend court. My neighbour herself tried to assault me last year and I do not even know if the housing association know the man who was arrested yesterday is living there. My neighbour and i share a front door on a street property. What can I do to ensure my safety and security now?