Intense clashes have taken place in the Iranian city of Zahedan, as anti-government unrest grips the country.br br Social media footage showed security forces firing into crowds, four weeks after dozens were killed in protests there over allegations a teenage girl was raped by a senior policeman.br br State media said one person was killed and 14 injured in Friday's violence.br br Iran has also been rocked by wider protests sparked by the death of a young Kurdish woman in police custody.