More than 900 people killed in Nepal-Tibet flood | BBC News

Now, let's turn to Nepal because the country is preparing mass burial sites for those people killed in Wednesday's devastating floods as the number of confirmed dead across Nepal and Tibet rises to 900 . More than 4,000 people are still missing . Authorities say that DNA samples are being collected from unidentified bodies so they can be matched with family members at a later date . Heavy machinery has been deployed to try to rescue hundreds of people who are believed to be trapped in a series of tunnels which are linked to a hydroelectric power station . Efforts to free them have been hampered by heavy rain and the rising river levels . It's emerged also that almost 900 pupils at a school had a real remarkable escape after some extremely quick thinking from a head teacher who moved them to higher ground with only 10 minutes to spare . Well, our world news correspondent, Joanne Wood, has this report . They do not know if anyone survives in these tunnels , but the Nepalese . This hydropower plant has now become one of the main focuses of an increasingly desperate search and rescue operation . It's thought hundreds of workers could be trapped . Our immediate national priority remains clear . To save lives, look at missing persons, rescue them, and provide urgent relief to survivors . Some of them have already been brought to safety . The conditions have only worsened since then . One of them, Saddam, is now safely in Kathmandu . He knows many of his colleagues may not survive . Friends who we worked with are missing . We've not been able to contact them, and I feel really bad for them . But rescue efforts are being hampered by the risks of further flooding . Over the weekend, Chinese teams identified a new lake that had formed . There are fears it could collapse . This is a country badly in need of some . And in Trishuli, it came from the quick actions of a head teacher credited with leading nearly a thousand students to safety