North Korea has executed one of its vice premiers, according to South Korean officials.

Pyongyang also banished two other senior officials, Seoul said on Wednesday, the latest in a series of punishments North Korean leader Kim Jong-un is believed to have ordered

"Vice premier for education Kim Yong-Jin was executed," said Jeong Joon-hee, spokesman for South Korea's unification ministry.

Kim was killed by a firing squad in July as "an anti-party, anti-revolutionary agitator", an official at the ministry, who declined to be named, according to the AFP news agency.

"Kim Yong-Jin was denounced for his bad sitting posture when he was sitting below the rostrum" during a session of North Korea's parliament, and then underwent an interrogation that revealed other "crimes", the official told reporters.

(Al Jazeera)