These Carrefocs are a group from the nearby seaside town of Cambrils
The "Carrefocs" (fire-runs) are among the most striking features present in Catalan festivals. In the correfoc, a group of individuals will dress as devils and light fireworks. While dancing to the drums of a traditional gralla, they will set off their fireworks among crowds of spectators (Wikipedia).
The church of Sant Mateu at dusk, just minutes before the celebration in the square to mark the festival of Sant Abdon and Sant Senen.