Police were called to an assault in the early hours over the weekend - but the victim has not been traced.
Officers taped off a road in Farnworth on Saturday morning after being called to reports of an assault.
Emergency services including police, forensics and crime scene investigators were at a scene on Peel Street near Market Street from 2.15am until 2pm as they investigated the area.
Neighbours say they saw crime scene investigators and there is speculation in the area as to what has happened, it has now been confirmed by Greater Manchester Police the cordon was in place due to an assault.
A spokesperson from Greater Manchester Police said: "The incident on Saturday on Peel Street was an assault – we are aware of it happening but unfortunately no victims have come forward.
"We were called to a report of a disturbance, officers attended, but no arrests have been made.
"Enquiries are ongoing to try and further establish the circumstances."
One resident said they saw a ‘lot of blood’ on the street, it is not known whether this is connected to the incident.
One told The Bolton News: “The cordon was in place from the early hours until 2pm.
“Forensics were putting down yellow markers but the police wouldn’t tell us anything.”
Whilst another resident said: "I heard loads of screaming and shouting outside which woke me up but I have no idea the severity of the injuries or if anyone was injured but they must be if the forensics and CSI were here."
Read more: Farnworth street taped off in the early hours after incident
Another resident said there was a 'brawl' and 'a car kept reversing and driving at people on the street'.
One said: "There is always trouble on Friday and Saturday each week, it went on for about half an hour."
Anyone concerned about these kinds of offences in their communities has been encouraged to contact police on 101 or 999 in an emergency.
Alternatively, witnesses can contact independent charity Crimestoppers on 0800 555 111.
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