More than 70 people in London have been arrested on suspicion of riot offences.
The coordinated raids by the Metropolitan Police were the largest-ever carried out as part of Operation Withern, which was set up to identify, arrest and prosecute people involved in the violence that hit London and other English cities in August.
More than 100 raids were executed at addresses across London, the police said. At least 77 people were arrested, police said.
The Met has made 3,423 arrests for a variety of offences since the riots.
Around 2170 people have been charged or summonsed after their arrest.
Scotland Yard thanked the public for their "positive response" to a plea to identify 200 people suspected of taking part in the violence.
Detective Superintendent Robin Bhairam said:
"Today's activity is an indication that four months on from the incidents seen across London we remain absolutely committed to identifying and arresting those responsible for the disorder.
"Following on from the release of over 200 suspect images on Flickr as part of the Winter Withern Campaign I would like to thank all those who have responded to our appeal in helping us to identify those wanted.
"A number of people have been identified and inquiries are still ongoing. There are still a number of people we wish to speak with and I would encourage anyone who has any information to please let us know.
"Searches like those carried out today are happening on a daily basis and my message to those who were involved in criminality is that you will not get away with it."