Seven men have been arrested in Brittany, western France, on suspicion of planning a terrorist attack, a source close to the investigation said.

The seven, who were arrested on Monday, were also suspected of having planned to travel to areas where terrorist groups were active, the source said.

France has been on high alert for Islamist attacks since a series of atrocities, mostly claimed by the Islamic State extremist group, cost more than 230 lives in 2015 and 2016.

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