Four people were killed and seven others injured after an explosion triggered a large fire at a factory in central Greece on Monday, according to Greek authorities.
U.S. broadcaster ABC News reported that the injured include a firefighter who was responding to the incident.
All those hurt were taken to hospital to receive medical treatment, while the fate of one person remains unknown.
Authorities have launched an investigation to determine the cause and circumstances of the explosion, which occurred near the city of Trikala, around 320 kilometers north of the capital, Athens.
Emergency services continued operations at the site as officials assessed the damage and monitored the situation in the surrounding area.
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