Telecomunicaciones y tecnología
Four missing, four injured in explosion at Spanish fireworks factory
The cause of the explosion at the factory on the outskirts of Zaragoza, near the city's airport, was unknown, a spokeswoman for the Aragonese emergency services said.
The blast at the factory, which makes fireworks and matches, was heard in a large area of the city.
TV and images on Twitter showed a large column of smoke rising from the factory. State television RTVE said emergency services could not get to the source of the blast because explosions were still happening.
"Please don't go near the area," Aragon's emergency services warned on Twitter.
El Pais newspaper said more than 110 people had died and many others had been injured in accidents at fireworks factories in Spain in the last 25 years.
(Reporting by Inmaculada Sanchez; writing by Sarah Morris; editing by Adrian Croft)