North Korea may be making preparations for another long-range rocket launch or other test, an analysis of satellite imagery has shown.

The findings come just days after activity was spotted at the Punggye-ri nuclear site, fueling speculation that the North may also conduct its third nuclear test of the year.

The apparent preparations come as Pyongyang marks the 71st anniversary of the ruling party's establishment Monday, and nearly 10 years to the date since the North conducted its first nuclear test on Oct. 9, 2006.