Police sealed off a street in a York suburb last night (Friday).
Officers cordoned off part of Pottery Lane in Heworth at around 10.30pm.
Detectives were on the scene for about three hours.
One witness told YorkMix that they had seen what they thought was blood in the street.
Another told us that police were called in after someone was assaulted.
The cordon was removed by Saturday morning. We will update with more details if we get them from North Yorkshire Police.