Police in Nottinghamshire say they are growing increasingly concerned for the safety of a missing international student.
Miron Filipovic, 21, from Groningen in the Netherlands, arrived in Nottingham in September to study business at Nottingham Trent University.
He is on an international exchange and was due to return to the Netherlands in February next year.
He was last seen by friends at a party on Saturday night.
Police said Mr Filipovic left his student accommodation in Radford to go to a friend's birthday party in halls of residence on Castle Gate in Nottingham city centre.
Sgt Neil Langham said: "Miron did not return home on Saturday night and his friends have not seen or heard from him since.
"His parents in the Netherlands have been informed and they are extremely upset and worried about him.
"His mother speaks to him almost daily either by phone or e-mail but has not heard from him."
Mr Filipovic is white, about 5ft 8ins (1.72m) tall, with shaven brown hair.
He was last seen wearing dark blue jeans, a white and green checked shirt and black shoes. He speaks good English.
Police said friends have described him as a "sensible, conscientious student".
Anyone who believes they may have seen him or who has any information about his whereabouts is asked to contact police.