Britain's National Crime Agency (NCA) said on Thursday it had arrested an Egyptian man suspected of coordinating the smuggling of thousands of people across the Mediterranean from north Africa to Italy.
The NCA said it believed the 40-year-old man, detained in London on Wednesday, was working with people smuggling networks in north Africa to organise boats for migrants and then communicating with criminal associates during the crossings.
"We suspect this man has been running his operation from the UK, and masterminding the smuggling of thousands of migrants," Darren Barr, Senior Investigating Officer at the NCA, said in a statement.
"The type of boats organised crime groups use for crossings are death traps ... We will continue to share intelligence and take action with partners to prevent crossings and arrest people smugglers here and overseas."
The NCA, which has been working with Italian Guardia di Finanza as part of the investigation, cited a crossing in October last year where more than 640 migrants were rescued by the Italian authorities after they attempted to cross in a wooden boat from Libya.
Another in December saw 265 migrants rescued by the Italian coastguard from a 20-metre fishing boat found adrift in the Mediterranean after leaving Libya, the NCA said, while in April two search and rescue operations which followed distress calls to the coastguard found more than 600 migrants on each boat.
US President Donald Trump has abruptly stepped back on Wednesday from threats to impose tariffs as leverage to seize Greenland, ruled out the use of force and suggested a deal was in sight to end a dispute over the Danish territory that risked the deepest rupture in transatlantic relations in decades.
Pakistani firefighters have retrieved the bodies of up to 25 people from the debris of a shopping mall fire in Karachi on Wednesday, taking the death toll to around 50.
Rescue workers in New Zealand have searched on Thursday for several people missing, including children, following a landslide at a campsite as heavy rains caused widespread damage and left thousands without power.
Israeli fire killed 11 Palestinians, including two boys and three journalists, in separate incidents in Gaza on Wednesday, local medics said, in the latest violence to undermine a three-month-old ceasefire in the war-shattered enclave.
US President Donald Trump ruled out the use of force in his bid to control Greenland on Wednesday, but said in a speech in Davos that no other country can secure the Danish territory.