Two men were both hospitalised after a fight in Strathfoyle in the early hours of Friday.
Detectives are appealing for information following the altercation between the two men in the Old Fort area.
As a result of this altercation two men aged 34 and 48 were arrested on suspicion of GBH with intent.
Detectives are appealing to anyone who may have been in and around the Old Fort area at between 2.30am and 3.00am yesterday morning and may have witnessed this altercation to contact Detectives at Reactive and Organised Crime in Strand Road on the non-emergency number 101.
Or, if someone would prefer to provide information without giving their details they can contact the independent charity Crimestoppers and speak to them anonymously on 0800 555 111.