ADEN - Armed clashes between supporters and opponents of a presidential election in Yemen left dozens of people wounded in the main southern city of Aden, activists from both sides said on Saturday. The violence erupted late Friday when supporters of the Southern Movement, a separatist group, attacked a march organised by rivals from a year-old protest movement against President Ali Abdullah Saleh, one activist said. More than 30 demonstrators were injured, some by gunfire, he added. A medical official confirmed that dozens of people had been hurt.