I hadn't realised Asian markets traded on Christmas Day. The smash in Japan was bigger than in Yank land. So big in fact that it's the top story at the BBC's site.

Japan's Nikkei index slides amid US uncertainty

Japan's main stock market index has plunged, reflecting traders' worries following a slide on Wall Street.

The Nikkei closed down 5% on Tuesday, its worst finish since April 2017. Indexes in Shanghai, Bangkok and Taiwan also fell.

Investors have been concerned about President Trump's dispute with the US central bank chief and another government shutdown.

US stocks had their worst Christmas Eve on record.

The Dow Jones index of 30 leading companies fell more than 650 points on Monday, and is on track for its worst December since 1931, during the Great Depression.

More: https://www.bbc.co.uk/news/business-46679094