China conducted another flight test of its newest and longest-range intercontinental ballistic missile last week amid growing tensions with the United States over the South China Sea.

Pentagon officials told the Free Beacon the flight test of the new road-mobile DF-41 missile took place Tuesday with two multiple, independently targetable reentry vehicles, or MIRVs, that were monitored in flight by U.S. military satellites and other regional sensors.

Officials did not say where the test took place. Past DF-41 launches were carried out from the Wuzhai Missile and Space Test Center in central China.

The latest flight test followed an earlier, rail-based canister ejection test of a DF-41 on Dec. 5.