SEOUL, South Korea (AP) — A new satellite image of a factory where North Korea makes military equipment used to launch long-range missiles shows the construction of a new structure.

The release of several images from Planet Labs comes amid concern that North Korea could launch a rocket or missile as it seeks concessions in stalled nuclear negotiations with the United States.

North Korea has warned that what "Christmas gift" it gives the U.S. depends on what action Washington takes.

One of the satellite images taken on Dec. 19 shows the completion of a new structure at the March 16 Factory near...