Sydney:A 16-year-old boy was killed and six injured early on Sunday in a knife fight at a party in Sydney city in Australia, police said. Police said the teenager was declared dead shortly after he was rushed to Westmead Hospital, EFE news reported. Of the six wounded, a 21-year-old man was in critical condition, while the others were discharged. According to several media outlets, the police received a call from a house in Sydney's Ryde suburb just after midnight, following a brawl among several young men at the party. The police said the case was being treated as a homicide. "This is a very, very serious matter and we hope to get to the bottom of it," he said, adding that investigators were waiting to speak to those present at the party.