<sod >A man named as Yassin Salhi, aged 35 and from Saint-Priest, near Lyon, was detained by a firefighter at the scene and has been detained.< eod>< sod > Forensic investigators and gendarmes next to the fence where the head was found in Saint-Quentin-Fallavier A man named as Yassin Salhi, aged 35 and from Saint-Priest, near Lyon, was detained by a firefighter at the scene and has been arrested.< eod>