Tens of thousands of people across several cities in Europe and Asia took to the streets to express their solidarity with the Black Lives Matter movement in the US.
Large protests were held in London despite government advice to avoid gatherings due to the risk of coronavirus.
The largely peaceful protests saw people holding placards reading "Black Lives Matter" outside the parliament.
Meanwhile, in the German city of Hamburg, police used pepper spray to disperse large crowds gathered in honour of George Floyd.
Protestors in Paris were also seen ignoring government order to ban demonstrations and gathering at the Place de la Concorde, close to the Embassy.
Protests were also held in Warsaw, Berlin, Brisbane, Sydney, Tokyo, Seoul and Bangkok.
In the US, protestors gathered across several cities for the 12th straight day to demand an end to police brutality and racism.
The US House of Representatives rejected an effort on Thursday to stop President Donald Trump's air war on Iran and require that any hostilities against Iran be authorized by Congress, backing the Republican president's military campaign.
Foreign ministers from the Gulf Cooperation Council (GCC) and the European Union have strongly condemned the Iranian attacks targeting GCC states, calling them a direct threat to regional and global security.
US President Donald Trump claimed the right to join Iran in deciding its next leader as the war escalated, with US and Israeli jets hitting areas across the country and Gulf cities coming under renewed attack.
British Prime Minister Keir Starmer said on Thursday that four additional Typhoon fighter jets would be sent to Qatar amid the ongoing regional developments, insisting that the UK has the right plan for defence.