Madrid, Dhu-AlQa'dah 16, 1436, Aug 31, 2015, SPA -- At least five people have been confirmed dead after a large blast Monday at a fireworks factory in north-eastern Spain, dpa quoted authorities as saying. Six other employees of the plant near the city of Zaragoza were hospitalized, some with serious injuries, said Gustavo Alcalde, prefect of the Aragon regional government. The cause of the accident at the more than 150-year-old Pirotecnia Zaragozana factory was not immediately clear. The explosion, which could be heard 10 kilometres away in Zaragoza, sent people running scared from their homes, the fire brigade said. Firefighters were unable to quickly enter the site due to several smaller explosions. Pirotecnia Zaragozana employs 40 people, according to the company website. -- SPA 21:44 LOCAL TIME 18:44 GMT www.spa.gov.sa/w