Summary from Sky...
Police called at 4am.
Two found dead in street.
Police called to another area where a van had run down two people.
Another man found dead in another street.
31-y-o man arrested on suspicion of murder.
It seems there was a tram derailment yesterday.
Unfortunately it's the top tweet when searching for Nottingham on twitter so a lot of people are taking it as gospel that it was today and spreading it further.