More than 4,000 officers were deployed and 11 arrests involved alleged hate crime offences as police kept rival marches apart.
On Saturday, the Metropolitan Police deployed over 4,000 officers in a £4.5 million operation to separate the Unite the Kingdom rally and a pro-Palestinian Nakba Day protest in central London, successfully preventing significant clashes.
The overlapping protests stemmed from anti-Islam campaigner Tommy Robinson, whose real name is Stephen Yaxley-Lennon, booking May 16 for his rally before the annual Nakba Day commemoration marking the 1948-49 Palestinian displacement.
Officers established a "sterile zone" around major landmarks and deployed live facial recognition cameras for the first time at protest operations, resulting in 43 arrests, including 11 for alleged hate crime offenses.
In an update on Sunday, the Met reported that 20 arrests were affiliated with the Unite the Kingdom protest, 12 with the Nakba march, and 11 unaffiliated, with no serious violence between groups.
Managing the concurrent events required 660 mutual aid officers from other forces, as the Met simultaneously policed the FA Cup Final at Wembley, stretching resources across the capital during the busy weekend.