In an explosion in a building in the Spanish capital Madrid, several people were injured on Wednesday, the authorities report.

The blast took place around 3 p.m.

Images show how the upper floors of the building have been completely destroyed.

It is not known how many people were in the building.

It is also unknown what the condition of the injured is.

The affected building is located

next to a retirement home,

according to

El País,

among others

.

There were no injuries or deaths among the residents and employees of the retirement home, a spokesman reports to the newspaper.

Emergency services are on site and ask everyone to keep their distance. The cause of the explosion is not yet known.