International desk: North Korea appears to be building new ballistic missiles in spite of warming ties with the Trump administration, media reports say.
Spy satellites spotted continuing activity at a site that has produced ballistic missiles, unnamed US officials told the Washington Post.
Reuters news agency quotes an official as saying it is unclear how far the work has gone.
President Donald Trump met North Korean leader Kim Jong-un in June.
After the first meeting between leaders from the two countries, the two men pledged to work towards denuclearisation. Mr Trump said the North was “no longer a nuclear threat”.
But Mr Trump was criticised at home for making concessions without securing any firm commitment from Mr Kim to end the nuclear and missile programmes.
What do the latest reports say?
On Monday the Washington Post newspaper quoted officials as saying the North Korea appeared to be building one or two new intercontinental ballistic missiles at the Sanumdong facility near the capital Pyongyang.
The factory produced the country's first intercontinental ballistic missiles capable of reaching the US, the paper adds.
According to Reuters, satellite imaging shows vehicles moving in and out of the facility, but not the extent of any missile construction.
These are not the first reports of that North Korea may be continuing its weapons programme, casting doubt on the real impact of the summit in Singapore.
In late June US media carried reports based on intelligence leaks suggesting that the North was still upgrading its nuclear enrichment sites, among other activities.
Last week Secretary of State Mike Pompeo told senators that North Korean factories “continue to produce fissile material” used in making nuclear weapons.
In April North Korea announced that it was halting its nuclear and missile tests.
