The explosion in a building in Madrid occurred while workers were checking the gas supply system in the house, the newspaper El Pais, citing police sources.
The powerful explosion was detected in a building in the La Latina district in the center of the Spanish capital. As a result, three upper floors were severely destroyed.
According to the latest reports, the accident killed four people and injured eight more. Six people were lightly injured, one was moderately injured and another person was hospitalized with severe injuries.
According to media reports, the explosion occurred in the house where the priests of a nearby Catholic church, Iglesia de la Virgen de la Paloma, reside. There is also a nursing home nearby.
Firefighters and police are on the scene. An evacuation is underway.