The official was not authorised to speak publicly on the matter and requested anonymity.
North Korea may be preparing to launch a rocket or missile, according to a US defence official and expert analysis of commercial satellite imagery.
The analysis published on Thursday comes just three weeks after North Korea drew international condemnation for conducted its fourth nuclear test explosion. The official told The Associated Press the US has seen activity at a ballistic missile test site that is consistent with previous tests, but the official would not go into more detail.
The official was not authorised to speak publicly on the matter and requested anonymity. The North Korea-focused website, 38 North, said it has detected what could be the early stages of preparation for launching a space launch vehicle at the nation's main rocket launch site at Sohae. It based its findings on satellite imagery taken this week.
North Korea fired its first rocket into space from Sohae, on its west coast, in December 2012, sending into orbit a satellite that soon malfunctioned. The North has said it has the right to launch rockets any time for its space program, but such long-range launches have drawn UN sanctions because similar technology can be used for development of ballistic missiles.
The UN Security Council is deliberating over how to respond to the January 6 underground nuclear explosion. The US is pressing for tighter sanctions a step that China, the North's only ally, appears reluctant to take.
Governments and experts have been sceptical about North Korea's claim it tested a hydrogen bomb, but whatever device the North detonated, it will likely push the country a step closer toward its goal of manufacturing a miniaturised warhead to place on a missile that can threaten the US mainland. A major launch would only deepen those concerns.
Initial word of a possible launch came Wednesday. The Japanese news agency, Kyodo, cited an unnamed Japanese government source as saying that satellite imagery analysis showed the North may be readying to fire a long-range ballistic missile from Sohae, and that the launch could occur in about a week at the earliest.
The 38 North analysis said a rocket test in the coming week appeared unlikely. Imagery from Monday showed vehicles or equipment and personnel near the rocket launch tower, but a rocket wasn't visible. The website said there's a high level of uncertainty about what snapshots of activity at the launch pad offered by the commercial imagery indicate. State Department spokesman Mark Toner declined to comment Thursday on the reports of preparations for a missile test, saying it was an intelligence matter.
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