A convoy of buses escorted by the police set out on Wednesday to take part in the evacuations

A maternity and children’s hospital in the city of Mariupol has been hit by a Russian air strike, Ukraine says.

President Volodymyr Zelensky said people were trapped under the wreckage, and called on Western leaders to impose a no-fly zone.

He also posted footage apparently from inside the hospital, which appeared badly damaged.

A regional official told Ukrainian media that at least 17 people were injured, including staff and patients.

Pavlo Kyrylenko, the head of the Donetsk regional administration which includes the port city of Mariupol, said no deaths had been confirmed, and there were no confirmed injuries amongst children. He said the attack happened during an agreed ceasefire with the Russian side, according to Interfax Ukraine.

The Mariupol city council said the strike had caused “colossal damage”, and published footage showing burned out buildings, destroyed cars and a huge crater outside the hospital. The BBC has verified the location of the videos.

“We don’t understand how it’s possible in modern life to bomb a children’s hospital. People cannot believe that it’s true,” Mariupol Deputy Mayor Serhiy Orlov told the BBC.

The White House condemned the “barbaric” use of force against innocent civilians, and UK Prime Minister Boris Johnson tweeted that “there are few things more depraved than targeting the vulnerable and defenceless”.

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