A report into the crisis called on the security council to "act urgently to ensure accountability" for grave violations.
The International Criminal Court is the appropriate institution for the fight against impunity in Syria. As an established, broadly supported structure, it could immediately initiate investigations against authors of serious crimes in Syria.
Individuals may also bear criminal responsibility for perpetuating the crimes identified in the present report. Where possible, individuals in leadership positions who may be responsible were identified alongside those who physically carried out the acts.
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Almost a fifth of hospital patients were also unable to reach their call button, a report warned.
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It comes after shadow chancellor John McDonnell made a surprise U-turn on the Tory budget vote which is due later today.