Romanians come second in the list of foreign nationals arrested by police for serious crimes, Scotland Yard has revealed.
Nearly 28,000 Romanian citizens have been held for serious offences in London over the past five years, including violence and sex crimes.
That puts it second only to Poland in the list of most arrested foreign nationals.
Sir Andrew Green, of Migration Watch UK, said: 'It is a matter of real concern that there should be such a substantial degree of criminality among those Romanians who have already come to Britain
Since 2008 27,725 Romanian citizens have been held for serious offences in London.
That includes, over the past five years, ten for murder, 142 for rape and 666 for other sex offences.
A total of 34,905 Poles have been detained by the force since 2008, including 84 for murder.
Lithuanians were the third most frequently arrested foreign nationals in the capital.
The arrests cover serious criminal offences including murder, rape, burglary, robbery, violent offences and sexual assaults.
Half of all crime committed in Britain by foreign nationals takes place in London.
The top ten countries of origin for foreign suspects are: Poland, Romania, Lithuania, Nigeria, India, Jamaica, Ireland, Somalia, Portugal and Pakistan
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