Travellers report multi-hour waits for some airlines as disruption also hits Brussels and Berlin.

"Train Americans," the US commerce secretary told big companies, some of which have relied on foreign high-skilled workers for years.

Officials are on high alert after the 2019 presidential election result was annulled due to vote tampering.

A host of countries, including France and the UK, are expected to do the same when world leaders gather at the UN General Assembly next week.

A host of countries, including France and the UK, are expected to do the same when world leaders gather at the UN General Assembly next week.