The latest on the Moscow concert hall attack

It's been a fast moving day of developments as authorities work to establish details around one of Russia's worst attacks. Here are the latest developments:

Rescuers are still searching through the charred remains of Moscow's Crocus City Hall after last night's attack, where at least 133 people were killed in a concert hall shooting.

The death toll is expected to "rise significantly", according to the city's governor.

President Vladimir Putin has made his first public statement since the attack, vowing to punish those responsible.

Putin has declared a day of mourning for Sunday 24 March.

He said all four gunmen have been arrested, and claimed they were trying to escape towards Ukraine and had people willing to help them do so.

Accusations of Ukrainian involvement have been labelled as "absurd" by Kyiv.

According to an unverified statement online, militant group Islamic State said it was behind the attack.

Muscovites are continuing to queue to donate blood for those injured and flower tributes have been placed at the scene of the attack.

(BBC)