REPUBLIKA.CO.ID, TOKYO -- North Korea may have the capacity to deliver missiles equipped with sarin nerve gas, Japanese Prime Minister Shinzo Abe said on Thursday, amid concerns that the reclusive state could soon conduct its sixth nuclear test or more missile launches.

"There is a possibility that North Korea already has a capability to deliver missiles with sarin as warheads," Abe told a parliamentary session.

Members of a Japanese doomsday cult killed 12 people and made thousands ill in 1995 in simultaneous attacks with sarin nerve gas on five Tokyo rush-hour subway trains.

Tensions on the Korean peninsula have escalated over Pyongyang's continued nuclear and missile testing programme, with the United States warning it could take unilateral action and sending a navy carrier group to near the Korean peninsula in a show of force aimed at detering more tests.

North Korea marks the 105th anniversary of the birth of state founder Kim Il Sung on Saturday, North Korea's biggest national day called "Day of the Sun". Leaders have in the past used the date to carry out weapons tests.

North Korea has launched several missile tests this year, the latest on April 5 when it fired a ballistic missile into the sea off its east coast. 

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