KATHMANDU: Four persons have been detained for allegedly robbing a man from Sindhupalchok of a gold chain and a mobile set from an overhead bridge near Purano Bus Park, KMC-31 of Capital on Thursday. Sundar Tamang (22) of Pogati-7, Dolakha district among four had reportedly robbed Amir Pratap Raut of the one-tola gold chain and a mobile set, police said. Further investigation is underway, police added.