Covid live news: Ardern blames spread of variants on ‘vaccine nationalism’; WHO calls for new Wuhan lab audit – as it happened

New Zealand PM says vaccine nationalism' behind fast-spreading virus variants; WHO proposes second phase of studies into Covid origins

• Extraordinary surge' in Covid cases across US driven by Delta variant
• England's Covid unlocking a threat to the world, experts say
• I am just heartbroken': Balearic travellers' fury with Covid U-turn
• Despair in Australia as lockdowns and failed vaccine rollout bite
• Ireland loosens Covid entry rules for under-12s, allowing family reunions

12.04am BST

11.42pm BST

Senegal's president Macky Sall threatened to close the borders and re-impose a state of emergency after the country registered a new record number of daily Covid-19 cases for the third time in a week.

The health ministry reported 738 new cases on Friday, more than the previous records of 733 on Wednesday and 529 on Sunday.