Two men were hospitalised an attack early on Sunday morning.
Police are investigating the attack which happened after 2am when the pair were walking near Magazine Street and Guildhall Square in Derry city centre.
One man is believed to have been involved in the attack and police are attempting to ascertain the motive for the attack.
A PSNI spokesman said: "One of the victims sustained injuries to his knee and hand, while the other victim sustained head and arm injuries. Both men attended hospital for treatment of their injuries.
"We are working to establish what happened and why, and we are keen to hear from anyone who was in the Magazine Street/Guildhall Square area at around 2am and witnessed what occurred. I am also appealing to anyone who has information about what happened to call us on 101, quoting reference number 313 04/07/21.
"A report can also be made using the online reporting form via www.psni.police.uk/makeareport Alternatively, information can be provided to Crimestoppers anonymously on 0800 555 111 or online at www.crimestoppers-uk.org."
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