La Sexta TV quoted government sources saying it may have been a gas leak. Officials could not immediately confirm.
Two witnesses also told news agency they heard a loud explosion. Video clip surfaces on twitter account of Darren McCaffrey, Euronews Political Editor
BREAK: Significant explosion in Madrid
Appears several floors of building destroyed
Cause not yet known pic.twitter.com/XmzuQIRYzX
— Darren McCaffrey (@DarrenEuronews) January 20, 2021
Another video on twitter from Carlos García E. REPUBLICANO, ANTIFASCISTA. near explosion site.
Una explosión en la calle Toledo un minuto después de pasar yo por ahí no sabemos que ha sido si es una explosión de gas o es otra cosa. pic.twitter.com/rP7JpdxVm9
— Carlos García E.🔻 (@CarlosGarcaEsc1) January 20, 2021
Smoke plume was observed in the neighborhood after the blast, witnesses reported.
Emergency services could not immediately confirm what had happened.