US President Donald Trump said "we'll see" when asked on Sunday whether the United States would attack North Korea.

His comment after leaving a church service came after sharp condemnation on Twitter earlier in the day following North Korea's overnight nuclear test.

Mr Trump described the test and North Korea's announcement that it had detonated a hydrogen bomb that could be attached to a missile capable of reaching the US mainland as "very hostile and dangerous to the United States".

The President also used the series of tweets to admonish South Korea for its handling of the crisis.