24 November 1912,
After a false alarm in Bilbao, 44 children and two adults drowned in the Bilbao Theatre Circus Ensanch. When the room was hanging, in the middle of the screening of a film someone screamed with fire. People tried to run out, one on top of another, and a lot of people drowned underneath. There was no fire.
Source:
Julio Arrieta, Forty-four white coffins (El Correo, November 18, 2012).