Streets of London thronged with pro refugees demonstrators
Protesters marched down the affluent Park Lane and the central thoroughfare Piccadilly carrying an array of colourful placards and shouting slogans including "say it loud, say it clear: refugees are welcome here!"
At one point, a group at the front of the protest performed a song and dance routine to Carly Rae Jepsen's "I Really Like You", cheered on by fellow protesters.
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Some carried signs reading "no-one is illegal", "stop the drowning", while others chanted "refugees - let them stay...Let's deport Theresa May!"
"I've come here today because my kids go to sleep in a safe house every night with full stomachs and I think every child should have that," mother-of-two Claire-Marie Goggin, 47, told AFP.
Volunteer worker Felicity Rose, 33, said the message was "to look after our brothers and sisters from round the world and let them come and to stop penalising them because of where they come from and the colour of their skin."
The event was organised by Solidarity with Refugees, and was supported by groups including Amnesty International, Oxfam, Medecins Sans Frontieres, the Refugee Council and Stop the War Coalition.
It comes ahead of Monday's UN Summit for refugees and migrants in New York, to be hosted by US President Barack Obama and attended by prime minister May.
Britain's then prime minister David Cameron announced last year the country would accept up to 20,000 refugees from Syria over the next five years.