The police in Croatia's southern Split-Dalmatia County on Tuesday confirmed that they were cooperating with Serbian police in the search for 27-year-old Matej Peris from Split, who went missing in Belgrade in the night between 31 December and 1 January. 

“The search and work on collecting information is underway,” the county police said.

According to a police report, Matej Peris was last seen at 2.30 am on 31 December at Belgrade’s Gotik night club, where he was with his six friends with whom he had arrived in Belgrade for New Year’s Eve. Police have been looking for him for five days.

Serbian media outlets have published a large amount of surveillance camera footage which Peris’s father claims shows his son. Boats have been searching the River Sava, where the Gotik nightclub is located, for several days, and today they were joined by divers. The young man’s father, Nenad Peris, is in Belgrade, cooperating with police and waiting for news about his son.

According to media reports, Matej’s friends returned to Croatia on Monday night. Serbian President Aleksandar Vucic said on Monday that police “have an idea” as to what happened to Matej, expressing hope that the young man would be found.

Without revealing details, Vucic said that “police will go public with information on the case.” He did not say when.