Belgian judoka Dirk van Tichelt was celebrating his bronze medal on Copacagana Beach in Rio when he was assaulted by unknown persons.
"His training partner's phone was stolen and as Dirk ran after the thief, he was punched in the face by someone else," Belgian Olympic Committee communications director Luc Rampaer told AFP.
"The police were nearby so he made a formal complaint and then was seen by a doctor at the hospital as a precaution, although there was nothing serious."