The National Crime Agency (NCA) believe seven of the UK's most wanted men could be in London.
The NCA is a national law enforcement agency which leads the UK's fight against serious and organised crime.
They are also often tasked to investigate crimes which cross regional and international borders.
A total of 22 people are named on their most wanted list and seven of them have links to London.
Here are their names, faces and stories.
Important: The NCA said members of the public should not approach any person featured on the list and in an emergency should call 999.
Jack Mayle
He is also alleged to have run a drugs line in south London and Surrey called Flavour Quest.
The NCA said he fled after he was charged.
Mayle was born in Croydon and has a distinctive tattoo reading 'Croydon' on his left forearm.
He also has a diamond tattoo under his left eye and tattoo which says “money never sleeps” on his left hand.
Mayle is around 30 years old, 5ft11in tall and has a muscular build.
The NCA said he is known to carry weapons; is a regular gym goer and is vegan.
Ozgur Demir and Osman Aydeniz
Ozgur Demir and Osman Aydeniz are wanted in connection with conspiracy to supply diamorphine.
They are said to have conspired to supply 17.83kg of the drug.
Three people have already been convicted in connection with this offence.
Both Demir and Aydeniz are Turkish nationals.
The NCA have asked anyone who knows of their whereabouts to get in touch.
Christakis Philippou
Between 2004 and 2006 he and co-defendants are said to have repeatedly set out to acquire, or sometimes to set up from scratch, travel agency businesses which were used as vehicles for fraud.
The travel agencies attracted customers by offering cut-price holidays.
The prices were so low that legitimate companies could not compete with them. In each case, the travel agency ceased to trade, leaving around 20,000 customers without a holiday.
Philippou, who is believed to be in London, is described as being around 165cm tall, with grey receding hair and tan skin.
Ersin Mustafa
He is a former employee of bank JP Morgan Cazenove's London branch between 2006 and 2008.
He is alleged to have obtained information about future acquisitions and mergers, which were provided to others who then traded using this information.
The group he is alleged to have been involved made approximately £2.5million.
He was arrested by City of London Police in 2008 and was released on bail.
But he has not been seen since and it is believed he fled the UK around December 2009.
The NCA believes he could be in London and he is described as being around 165cm tall, of stocky build with dark hair and tanned skin.
Daniel Dugic
The offence is said to have taken place in 2011.
The conspiracy involved a small UK vessel meeting a commercial container ship in the English Channel from which the drugs were transferred.
Although Dugic was not on board either vessel, he is alleged to have played a major part in organising the importation.
A number of other individuals were convicted of the crime but Dudic was never brought to justice.
Originally from Serbia, it is thought that Dudic could be in London.
John Barton
The sentencing took place in his absence and Barton has never seen justice.
The crimes took place between 1999 and 2000.
He is believed to have links to Fuengirola in Spain as well as London.
Barton is described as around 170cm tall, of medium build, with dyed receding hair.
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