An explosion shakes the center of the Spanish capital, Madrid

 Today, Wednesday, a violent explosion rocked the center of the Spanish capital, Madrid, while official authorities have so far not provided any information about it.

"La Sixa" TV channel reported that a huge explosion was heard in the center of the Spanish capital, Madrid, without giving further details.

The emergency services have not yet confirmed what happened.

Activists on social media in the country posted videos that they said were of the site of the explosion.

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