A man has been charged in Italy in connection with the deaths of 39 migrants found in a lorry in 2019.
Police said Dragos Damian, 27, was held near Milan by National Crime Agency officials and Italian authorities.
The Vietnamese migrants were discovered in a refrigerated lorry trailer in Purfleet, Essex on 23 October 2019.
Mr Damian has been charged with conspiracy to assist unlawful immigration and encouraging or assisting the commission of an offence.
Essex Police said it was awaiting details of when Mr Damian would appear before the Italian courts.
Following a trial at the Old Bailey, four men were jailed in January for manslaughter.
The court was told all on board died having suffocated in the container that travelled from Belgium to Purfleet.
Ronan Hughes, 41, and Gheorghe Nica, 43, played "leading roles" in the smuggling conspiracy and were jailed for 20 and 27 years respectively.
Two lorry drivers were also jailed for manslaughter.
Eamonn Harrison, 24, who towed the trailer to the Belgian port of Zeebrugge before their journey to the UK, was sentenced to 18 years.
Maurice Robinson, 26, was given 13 years and four months, having collected the trailer and opened it in an industrial estate to find the migrants dead.
Three others members of the people-smuggling gang were also sentenced for conspiracy to facilitate unlawful immigration.
Christopher Kennedy, 24, from County Armagh, was jailed for seven years; Valentin Calota, 38, of Birmingham, for four-and-a-half years; and Alexandru-Ovidiu Hanga, 28, of Hobart Road, Tilbury, Essex, was given a three-year sentence.