Amnesty International, a human rights group, has released a report saying Syrian security forces tortured and killed detainees in response to continuing protests against President Bashar al-Assad's rule. <br /><br />The London-based organisation said on Wednesday that it had gathered proof of such crimes by the government in the northern town of Tell Kalkh. <br /><br />Amnesty called for the UN Security Council to refer the Syrian government's alleged actions to the prosecutor of the International Criminal Court.<br /><br />Al Jazeera's Call Perry reports.