Firefighters worked the scene of a fire involving five semi-trucks at a travel center off Interstate 40 Wednesday morning.

Officials say the blaze started at 4:05 a.m. at the Hana travel Plaza

Officials said one of the semi-trucks contained pool cleaner, an oxidizing agent, which caused it to create oxygen as it burned and “enhance the fire.”

Another truck was filled with recycled plastic, which Snyder said presents a challenge when extinguishing a fire.

Officials said the fire caused toxic smoke due to the plastic materials. Crews call the fire under control at 6:40 a.m.

No one was injured and the Amarillo Fire Marshals Office is investigating the incident.