A massive explosion at a petrochemical plant in northeastern Spain has killed one person and injured at least nine others. 

A local government spokesman for the port city of Tarragona said a preliminary investigation indicated the force of Tuesday's blast killed an individual in a nearby neighborhood. 

The explosion took place at the premises of Iqoxe, which produces compounds for detergents and plastics, among other products. 

The civil protection agency in Spain's Catalonia region called the blast a “chemical accident” and warned people in parts of Tarragona and in nearby towns to refrain from going outside as a precaution. 

Local residents posted videos showing flames and a big column of black smoke.