The explosion at the factory of the Pirotecnica Zaragozana, a company established in 1860 which employs 40 people in a 12-hectare site, happened at 2:15 p.m. local time (1215 GMT) and could be heard up to 20 km away, according to local media.

http://www.lavanguardia.com/sucesos/20150831/54435040207/tres-desaparecidos-y-cinco-heridos-en-la-explosion-de-pirotecnica-zaragozana.html