Morning news brief: Martial law declared in Yangon, AstraZeneca finds no evidence of blood clot risks, and more

Here are the biggest news stories of the morning: Clashes continue in Myanmar as military crack down on protesters, while Joe Biden says that Quad summit went very well. AstraZeneca, which has been embroiled in a controversy over fears of blood clots has denied finding any related results in its findings. This and more below - click on the headline to read the full story.