North Korea is to hold what is expected to be one of its biggest celebrations ever, marking 70 years anniversary of the ruling Workers' Party.
A cavalcade of armoured vehicles and ballistic missiles is expected to rumble through the capital Pyongyang accompanied by marching troops.
North Korea's supreme leader Kim Jong-un will preside over the ceremony, but no world leaders will be attending.
Heavy overnight rain was reported to be delaying the start of proceedings.
Correspondents say Saturday's event will be closely watched for any new military hardware indicating the North's military development.