Virologist tells The Telegraph he was given a tour by Chinese health officials in 2014 to see 'where a disease could emerge'

Director of international health body says all hypotheses are on the table; Washington voices concerns about probe in tug-of-war with Beijing

Four-week mission to Wuhan wrapped with no conclusive findings; Chinese refuse sharing requested raw data

International health body announces findings by mission dogged by fears of whitewash, with US demanding 'robust' probe and Beijing warning against 'politicizing' investigation

Delayed by China and weighed down by political baggage, investigative mission has a remit to explore how virus jumped from animals to humans

Medical team embarks on long-awaited mission but finding source of pandemic will likely take years; effort is politically charged as China seeks to avoid blame for missteps

Chinese city marks 1 year since world's first coronavirus lockdown, as WHO experts set to begin investigating origins

Beijing maintains virus came from abroad; Chinese government spokesman says they will 'exchange views' but gives no indication whether scientists will be allowed to gather evidence

As 4,470 die of coronavirus, authorities set January 26 as date to expand existing measure that previously only targeted UK; other countries also tighten restrictions

Zhang Zhan has been detained since May, and lawyer says her health is declining; prosecutors demand 5-year sentence for 'picking quarrels and provoking trouble'