A police horse knocked a woman unconscious as mounted officers and others armed with water canons raided a lockdown-breaching 'festival' which turned out to be an April Fools joke.
Clashes between revellers and police erupted at Bois de la Cambre park in Brussels, Belgium, after huge crowds arrived for Thursday's event, which was actually a Facebook prank.
Up to 5,000 people descended on the park despite Belgium's Covid rules banning gatherings of more than four people.
The original post had promised "eight stages, a hundred DJs and zero coronavirus rules", with acts including a one-off reunion of recently split dance group Daft Punk.
But social media users seemingly failed to appreciate the joke, given it was April 1, and turned up in their hordes.
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As a result, mounted police waded in to try and clear the party-goers but ended up trampling people, before blasting water cannons.
Footage shows one woman being smashed into by a horse, with her condition unknown.
In the horrific footage, around eight mounted officers are seen galloping through a clearing in the park before one horse strikes the woman as her back is turned.
She immediately falls to the ground, though the officers continue riding before other party-goers rush to her aid.
She was reportedly one of two people hospitalised following the clashes which saw at least eight revellers and several officers and their horses injured.
Earlier this week, mayor of the City of Brussels Philippe Close insisted the event was "unauthorised and fake", but warned people may gather regardless.
He said police would be present at the park and will "act with discernment in the event of an actual gathering", while urging people not to attend.
However, those who did were met with a stern response by waiting units.
A raft of stricter measures were announced in Belgium in March to combat the third wave currently sweeping through Europe.
These include a 10pm curfew in place in most areas and all bars, cafés and restaurants closed, as well as schools.
Non-essential shops are open but they can only be visited with a pre-booked appointment.
All outdoor gatherings are also now limited to just four people.
