The Metropolitan Police has launched a new operation to deal with foreign criminals operating in London.
Operation Nexus, which has been running since September, aims to identify people who should be deported.
Simon Harris reports.
Assistant Commissioner Mark Rowley from the Met said: "We've taken a fresh look at policing London and London's obviously a world city.
"The recent census has shown what a big proportion of people in London come from far-flung places...It's important to us to be able to deal equally well with them as local offenders."
Many of the Operation Nexus's successes have come as a result of posting UK Border Agency officers in 21 custody suites across London.
This now allows UKBA to run real-time immigration checks on individuals bought into custody suites for a crime and establish if they are wanted abroad, have previous convictions abroad or are here illegally.
Nexus also provides UKBA and police with additional tactics.
The sharing of intelligence now supports the removal of cases where previous charges have been dropped due to victims or witnesses refusing to cooperate with police due to intimidation or fear of retaliation.
Police will today give an update on Operation Nexus, which concerns the deportation of foreign nationals responsible for serious crimes.
A joint operation between the UK Border Agency and the Metropolitan Police Service, 165 of London's most prolific foreign national offenders have been removed since September.
Police intelligence shows 27% of all those arrested for a criminal offence in London were foreign nationals.
Some of London's most notorious criminals have been deported, including one of the city's top 25 gang members and a violent sex-offender.