Dec. 12 (UPI) -- Activity at North Korea's Sohae Satellite Launching Station is rising following what Pyongyang has described as a "very important test" of a rocket engine.
It is likely the North is intentionally sending a message from the site.
A South Korean military official told local television network SBS North Korea "knows its activities are being exposed to U.S. and South Korea military authorities," and yet the regime "is mobilizing vehicles and equipment, hinting at a provocation by sending a message."
On Thursday 38 North published new commercial satellite imagery showing continued activity. According to U.S. analysts, a truck is seen parked next to the newer "fuel/oxidizer bunkers."
"A possible crane is nearby, but the limited resolution of this image precludes a more definitive assessment," the analysts said.
U.S. officials have warned North Korea against serious provocations, including the launch of a long-range missile capable of reaching the continental United States.
President Donald Trump "has said he wants to work with North Korea," said David Stilwell, U.S. assistant secretary of state for East Asian and Pacific affairs on Thursday. "He wants to help build their economy. But there's also the reminder that we can't have any more of this unfortunate, ill-advised behavior, and that hasn't changed. That position is the same."
As tensions rise, the United States remains committed to talks with Pyongyang.
South Korean television network JTBC reported Friday U.S. special envoy for North Korea Stephen Biegun will visit the South on Sunday for a three-day trip.
Biegun's visit is raising the possibility he could visit the border village of Panmunjom and make contact with the North Koreans.
Earlier this week at the United Nations Security Council, U.S. Ambassador Kelly Craft warned North Korea against "deeply counterproductive" weapons tests.
"Ballistic missiles will not bring greater security," Craft said.