New York City Mayor Michael Bloomberg has taken part in his last St. Patrick's Day parade as mayor of the city:
More top news
Scientists used modern forensic techniques to review the 'cold case' and determine the victim was probably killed by two blows to the head.
US computer science expert says "endpoint" of lethal drone technology is killer robots that choose targets via artificial intelligence.
All leave for doctors in India has been cancelled as the death toll - and temperatures - continue to rise.