A man is currently receiving hospital treatment following an 'assault by a number of males'.
Police say the man, aged in his 30s, sustained serious facial injuries in the incident.
A PSNI spokesman said: "Detectives in Derry/Londonderry are investigating a serious assault and are appealing for information.
"Police received a report of an ongoing disturbance in the street at Bloomfield Park shortly before 1.30am on Saturday 4th July.
"It is believed at this time that one man was assaulted by a number of other males. The man, aged in his 30s, sustained serious facial injuries as a result and is currently receiving hospital treatment.
"A 32-year-old man has been arrested on suspicion of grievous bodily harm with intent and taken into custody.
"Anyone with any information about this incident or who may be able to help with the investigation is asked to call detectives on the non-emergency number 101 quoting reference number 184 04/07/20, or submit a report online using our non-emergency reporting form via http://www.psni.police.uk/makeareport/.
"You can also contact Crimestoppers anonymously on 0800 555 111 or online at http://crimestoppers-uk.org/."
