S. Korean defense report: N. Korea serious threat

South Korea's Defense Ministry called North Korea a serious threat in a new report Friday, saying it is believed to have about 50 kilograms (110 pounds) of plutonium, enough to produce up to seven nuclear weapons. The biennial defense report also said the North is believed to be capable of producing biological weapons, including anthrax weapons, and possesses up to 5,000 tons of toxic agents housed at many facilities. The report described North Korea "as a serious threat, considering the serious nature of its nuclear test and threat of weapons of mass destruction," the ministry said in a statement.