A 10-year-old boy was hit in the eye with an object thrown from a hotel window in The Hub.
The victim was passing the Ramada Encore Hotel when he was assaulted at about 6.50pm on Saturday.
He suffered swelling and a small cut to his eye, but did not need medical treatment.
PC Michelle Dempsey said: “I would appeal to anyone with any information about the offence to contact police via 101. “I would particularly appeal to a member of the public who shouted up at the window from where it is believed the object was thrown.
“If you don’t want to speak directly to the police you can contact Crimestoppers anonymously on 0800 555 111 or online at www.crimestoppers-uk.org.
“No personal details are taken, information is not traced or recorded and you will not go to court.”