Top military officials believe North Korea will begin another round of nuclear testing in honor of the anniversary of late founder and grandfather of Kim Jong Un.
Tens of thousands of residents marked the 105 anniversary in the capital with a military parade.
Today is known as the "day of the sun" to North Koreans.
North Korea has conducted four-nuclear missile tests so far this year increasing tensions between the US and South Korea.
The country has previously used holidays and anniversaries as a showcase for its arsenal of weapons.