A fire at an Exxon Mobil plant in Texas injured at least four people Thursday morning, local authorities reported, with three people transported to the hospital by Lifeflight.

The fire occurred around 12:51 a.m. local time in Bayton, which is located about 30 minutes from Houston. The Bayton Fire Department confirmed that no fatalities have been reported, adding that the unit has material with gasoline components.

At around 3 a.m., Exxon Mobil posted a statement to Twitter writing that the emergency vehicles and smoke may be noticeable to the community. The company said it’s coordinating with local officials and working to resolve the issue as soon as possible.

By 7:30 a.m., Exxon followed up with another statement confirming that emergency response teams are continuing to extinguish the fire.

“Our first priority is people in the community and in our facilities. Air monitoring continues along the fence line. Available information shows no adverse impact a this time. No shelter in place has been call for our community and near neighbors. We deeply regret any disruption or inconvenience that this incident may have cause the community,” the statement read.

Local residents posted to Twitter reporting that they heard a boom and that their houses were shaking from the incident. Another person asked if it’s safe to go to sleep since she lives very close to the plant.

Harris County Sheriff Ed Gonzalez responded, “no word yet, will determine that asap and advise.”