After almost a year of inactivity, work as resumed at a North Korean missile facility in an effort to make it capable of launching larger rockets, Fox News reports.

Commercial satellite images show what appears to be a rocket assembly building and launch control center at the site in the northeast coastal area of Tonghae, Fox reported.

38 North, the website of the U.S.-Korea Institute at Johns Hopkins School of Advanced International Studies, first reported the work at the old facility.

"There had been previous speculation that the construction hiatus at Tonghae and the start of major new projects at the Sohae Satellite Launching Station this past summer may have meant Pyongyang was gradually abandoning the older site," the 38 North website said.

"However, the restart of work at the new Tonghae facilities indicates that North Korea is still committed to maintaining two launch sites for a larger space launch vehicle (SLV) reported to be under development."

Overhead photos indicate a previously mothballed plutonium reactor has been restarted and another launch site in Sohae is being upgraded.

But no long-range rocket launch is expected by year's end, 38 North said.

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