North Korea may have the capacity to launch a warhead loaded with sarin nerve gas, Japanese Prime Minister Shinzo Abe said on Thursday, as tensions rise over the country’s missile and nuclear programmes. Sarin has been used in deadly domestic attacks in Japan, notably in 1995 when the Aum Supreme Truth cult released it in the Tokyo subway killing 13 people and sickening 6,000 others. “There is a possibility that North Korea is already capable of delivering (via missile) a warhead containing sarin,” Abe told a parliamentary diplomacy and defence committee, referring to the poison nerve agent.