North Korea has been spotted moving what appears to be an intercontinental ballistic missile towards its west coast, according to reports.

The rocket started moving on Monday, a day after North Korea's sixth nuclear test, an unidentified intelligence source told South Korea's Asia Business Daily.

The rocket was spotted moving at night to avoid surveillance, the report said. North Korea has launch facilities for its missile program on its west coast.

South Korea's defence ministry said they were unable to confirm the contents of the report.

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The ministry said in parliament on Monday that North Korea was considered ready to launch more missiles, including ICBMs, at any time.

It comes amid speculation the rogue nation may be planning to fire an ICBM as early as this weekend when the republic celebrates its foundation on September 9.