Detectives are waiting to question one of Scotland Yard's most wanted men following his arrest in Bangladesh.
Officers have been wanting to speak to Ayab Khan, 27, since a double murder in east London in 2003. Amarjit Singh, 52, and his nephew Rajinder Singh, 35, were shot dead near the hotel they owned in Forest Gate.
Police are now seeking his formal extradition to Britain following the arrest in Dhakar.
Khan, originally from Chigwell, Essex, was detained as he was on his way to an airport, it was believed.
A Met police spokesman said: "A man believed to be Ayab Khan was arrested on Thursday August 5 in Dhaka by Bangladeshi authorities.
"The arrest was made on behalf of the Metropolitan Police Service. We will now seek the man's formal extradition to the UK."
The Met had offered a reward of £10,000 for information leading to Khan's arrest and conviction. In 2004 he was placed on Scotland Yard's Most Wanted list.
Khan arrived in Bangladesh last week to visit a friend in north-eastern Sylhet district, it was reported locally.
The uncle and his nephew - both businessmen - were shot with an Uzi-style machine gun following an argument, it was reported at the time.
At the time of the killings, the police said the pair may have been shot dead following a row about parking.