The Sagrada Familia, a large and unfinished Roman Catholic church designed by renowned architect Anton Guadi, was shut off following reports of a supicious package found in a van parked close to the attraction.
Spanish media is reporting that two people have been arrested in connection with the operation.
Catalan's Mossos police officers stormed into the temple at about 8.15pm local time and cleared everybody out and away from the area.
Businesses and nearby metro stations have also been evacuated.
EXPRESS
The Sagrada Familia in Barcelona has been cordoned off by counter terror police
TWITTER
the operation is beleived to be focused on a suspicious package discovered in a vanSeveral roads have also been closed.
READ MORE: http://www.express.co.uk/news/world/853297/Barcelona-terror-Sagrada-Familia-Catalonia-police-evacuation