GETTY Danish police arrested four terror suspects on Thursday

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Four terror suspects were arrested in the capital Copenhagen on Thursday as investigators across Europe race to foil jihadi plots. Police believe the group were recruited by Islamist extremists in Syria to carry out attacks on the West.

Ammunitions and weapons were also found in a connected search in the Danish city, police said. A statement said: "The arrests took place as part of efforts to combat people enlisting in terrorist groups in the war-torn areas in Syria and northern Iraq."

Brussels terrorist attacks Wed, March 22, 2017 The Brussels airport and Metro bombings in pictures, including the aftermath of the tragic scenes. Play slideshow AFP/Getty Images 1 of 61 A member of the civil protection holds his face in his hands as he come back from the Maalbeek metro station in Brussels

REUTERS Danish authorities have been on high alert

GETTY Islamic State has claimed responsibility for bombing that killed 32 people in Brussels last month