Six suspected members of Daesh (ISIS) were arrested in Spain, Britain and Germany on Wednesday in an operation led by Spanish authorities investigating an extremist recruiting network, the Spanish interior ministry said.

Raids were continuing Wednesday morning targeting the group, based on the island of Majorca and led by an Islamist imam, who was arrested in Britain, the ministry said in a statement.

“The investigation focuses on terrorism material created for use online,” the West Midlands police said, adding that prosecutors would seek his extradition to Spain later Wednesday.

The investigation began in 2015 after authorities discovered videos posted to the internet describing a young Muslim living in Spain and his radicalization, and his eventual departure for Syria.

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