Police on Saturday arrested four suspected extremists in the Spanish territory of Ceuta bordering Morocco and were investigating whether they were planning attacks in Spain, the government said.
They were the latest in a string of suspects seized in Ceuta and Spain's other north African territory, Melilla, where authorities have been monitoring suspected extremist cells.
Police searched two properties in the dawn raids that yielded the arrests, the interior ministry said in a statement.
"They are investigating whether those arrested, who formed a cell, had the infrastructure to carry out an attack on our national territory," it said.
It made no link between Saturday's arrests and an ongoing investigation into suspects linked to this month's deadly attacks in Paris and other foiled plots in Belgium, some of whom are said to have traveled to Spain.
Spanish police have arrested about 50 suspected extremists over the past year, the ministry said this month.
It said Saturday's operation was ongoing and it would release further details of the raids later.
Source: News Agencies, Edited by website team