BATON ROUGE – The conditions of four people who were injured in a fire at the Exxon refinery have been upgraded.

According to hospital officials, one patient has been upgraded to fair condition while three others have been upgraded to serious condition.

Emergency crews were called to the refinery on Tuesday around 4 p.m. Four of the five people that were injured were taken to the Regional Burn Center at Baton Rouge General. All four were reported in critical condition following the fire on Tuesday night.

WBRZ was told that the fire involved Isobutane, used in refrigeration systems and as a propellant in aerosal sprays.

Exxon released a statement on the workers' conditions and the incident on Wednesday:

"The ExxonMobil Baton Rouge Refinery continues to operate. As a matter of practice,  we do not comment on the operational status of specific units. We continue to meet contractual commitments.

Following yesterday's fire, the condition of the injured workers remains unchanged. Our thoughts and prayers are with them and their families during this difficult time."