Riot police have clamped down on parts of London after clashes broke out between officers and hooded youths on Sunday evening.
A police spokesperson said over 100 had been arrested through the night and warned police would not tolerate violence.
"Officers are shocked at the outrageous level of violence directed against them. At least nine officers were injured overnight in addition to the 26 injured on Saturday night.
"We will not tolerate this disgraceful violence. The investigation continues to bring these criminals to justice."
Three officers were injured and Home Secretary Theresa May plans to return to the UK to meet police chiefs about the violence.
There were also reports of looting and violence in Brixton, south London, Islington and Walthamstow in north London and in the west end.
Walthamstow MP Stella Creasy said she would hold a pop-up surgery for residents concerned by the rioting, but sought to reassure Londonders; "What we saw tonight in Walthamstow was violent looting- anger directed at buildings with goods in not police or people."
In Brixton, reports from the ground suggested youths attacked riot police with bricks and looted nearby shops.
Around 200 youths were said to be out on the streets of Enfield in north London on Sunday evening while other reports said a group of about 30 were carrying bricks in the town centre, as tension remains high following overnight riots in nearby Tottenham.
Sky News showed footage of a damaged police car on Enfield High Street while a BBC reporter tweeted that young girls were throwing concrete slabs through shop windows.
Other pictures posted on the social networking site showed an HMV store which appeared to have been looted and a number of police vans parked outside a Tesco, which had earlier been the scene of some scuffles.
Enfield MP Nick de Bois tweeted on Monday morning that Enfield Town Centre was now a crime scene; "Have had escorted walk through Town Centre, very angry to see damage to shops and police car Police here now working on crime scene."
The Metropolitan police said it had extra resources out across London following the troubles on Saturday night, which saw buildings, police cars and a bus burnt out in the high road, resulting in 55 arrests.
"We are carefully monitoring any intelligence and ensuring we have our resources in the right places. No one wants to see a repeat of the scenes that we witnessed last night in Tottenham," Commander Christine Jones said in a statement.
Violence broke out following peaceful protests over the death of Mark Duggan, who was killed by police last week.