North Korea has started rebuilding a key missile test site, analysts believe after spotting changes in recent satellite images of the facility.

Cranes were visible in parts of the Sohae Satellite Launching Station, which is used to send satellites into orbit and test technology linked to intercontinental ballistic missiles.

The activity dates from between mid-February and early March – meaning it happened either before, during or just after Donald Trump’s meeting with Kim Jong-un, the North Korean leader, in Vietnam.

Those talks collapsed after Mr Trump refused Kim's offer to dismantle a major nuclear facility in return for lifting all economic sanctions adopted during his presidency.

Two respected North Korea expert groups, the Center for Strategic Studies' Beyond Parallel project and 38 North, both concluded there had been activity at the site after studying satellite footage.