The visitors were leading 1-0 thanks to Fabian Orellana's goal in the 83rd minute when the object was thrown from the Villarreal section of the crowd and landed in the Celta penalty area.

None of the players were struck, but referee David Fernandez Borbalan quickly suspended the game after the fans sitting near where the smoke bomb had landed rushed to the exits covering their mouths and noses.

However, after the smoke had subsided, it was announced that both sides would return to the field to finish the game.

It is the second time this week that a match in Spain has been blighted by an object thrown from the crowd as Atletico Madrid were fined 600 euros ($820) after Real Madrid's Cristiano Ronaldo was struck on the head by a lighter during their Copa del Rey match on Tuesday.