Coronavirus live news: Italy extends state of emergency as WHO warns of 'one big wave'

Three regions in Spain highlighted; global cases doubled in last six weeks; deaths worldwide pass 650,000

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11.22pm BST

US president Donald Trump abruptly ended a press conference on Tuesday after a sustained question from CNN's Kaitlan Collins over a video he had shared by a doctor who said masks don't work and that there is a cure for Covid-19. In past videos, said Collins, the doctor has claimed that medicines are made from alien DNA".

I thought she was very impressive," Trump said of the woman in the disinformation video he promoted.

The video in question featured Dr Stella Immanuel, a physician from Houston, Texas, speaking on the steps of the US Capitol in Washington, surrounded by members of a rightwing doctors' group.

Immanuel made baseless claims about coronavirus, including hailing hydroxychloroquine as a cure", even though the drug, which has been repeatedly touted by the president, has not been found to be an effective treatment.

.@kaitlancollins: The woman you say is a 'great doctor' said masks don't work & doctors make medicine using DNA from aliens-

TRUMP: "I can tell you this: She was on air, along with many other doctors, & they were big fans of hydroxychloroquine. I thought she was very impressive" pic.twitter.com/nSui8DOLDL

11.13pm BST

Hi, Helen Sullivan joining you now. I'll be bringing you the latest developments from around the world for the next few hours.

Get in touch on Twitter @helenrsullivan or via email: helen.sullivan@theguardian.com.