A laboratory in the Chinese city at ground zero of the global coronavirus outbreak has rejected US theories that it spawned the pandemic, as President Donald Trump warned Beijing of consequences if it was "knowingly responsible".
The denial came as world governments were debating how and when to ease lockdowns that have kept more than half of humanity -- 4.5 billion people -- confined to their homes and crippled the global economy.
Many of the world's 260 million Orthodox Christians were forced to mark Easter at home on Sunday, with church leaders telling worshippers to stay indoors and conducting services online or on television.