At least two people were killed in an explosion at a gas refinery in the Italian commune of Calenzano near Florence on Monday, according to reports from the Italian news agency Agenzia Nova, citing authorities. At least nine more people were injured, and four were initially still missing, the agency said.

Emergency responders, police, and firefighters were deployed to the scene in a large-scale operation. The local authorities issued a warning, urging the populace not to approach the affected area. The refinery involved is reportedly part of the Eni company.

The exact circumstances of the incident were initially unclear. The causes of the accident are currently under investigation, it was stated.