Search underway for 'thousands' believed to be underneath Syria's 'slaughterhous

Search teams have heard noises and believe thousands of people are trapped in underground cells in the notorious Sednaya prison in Syria. • Subscribe to ITV News on YouTube: http://bit.ly/2lOHmNj • Get breaking news and more stories at http://www.itv.com/news Follow ITV News on Facebook: https://www.facebook.com/itvnews/ Follow ITV News on Twitter: https://twitter.com/itvnews Follow ITV News on Instagram: https://www.instagram.com/itvnews/