A man has been arrested in Birmingham on suspicion of terrorism offences in connection with a Spanish investigation into support for the so-called Islamic State, police say.
Five others are being held – four on the Spanish island of Majorca, and one in Germany.
The 44-year-old man was arrested at an address in the Sparkhill area of the city under a European Arrest Warrant.
He is due to appear at Westminster Magistrates’ Court later.
Spanish authorities allege he produced films containing violent content that were circulated on the internet.
The suspects are also accused of organizing secret weekly meetings to recruit young people to travel to conflict zones to fight, the Spanish interior ministry said.
The investigation, led by Spanish police, began in 2015 after police discovered a series of videos online that showed the the indoctrination, capture and journey to Syria of a young Muslim living in Spain, reports say.