Great Britain's Alex Yee wins silver in a punishing men's triathlon at the Tokyo Olympics as Kristian Blummenfelt of Norway claims gold.

Dust clouds towered at least 100 metres (330ft) over Dunhuang.

The billionaire offers to pay $2bn in Nasa costs to be reconsidered for a key Moon lander contract.

Khuzestan is one of the country's hottest regions, where temperatures can reach 50C.

At the age of 13, Japan's Momiji Nishiya wins the first-ever Olympic gold medal in women's street skateboarding.

A two-week virtual negotiation begins on the most critical climate change report since 2013.

There have been more than 1,600 civilian deaths so far in 2021, and the UN fears a further rise.

US Deputy Secretary of State Wendy Sherman is the most senior official to visit under Mr Biden.