Smoke rise following a big explosion at an industrial hub near the port city of Tarragona, Spain, Tuesday, Jan. 14, 2020. A chemical emergency alert has been activated in northeastern Spain following a big explosion in an industrial zone near the port city of Tarragona, regional emergency services said Tuesday. (AP Photo/David Oliete)

Smoke rise following a big explosion at an industrial hub near the port city of Tarragona, Spain, Tuesday, Jan. 14, 2020. A chemical emergency alert has been activated in northeastern Spain following a big explosion in an industrial zone near the port city of Tarragona, regional emergency services said Tuesday. (AP Photo/David Oliete)