SPRINGDALE, Ark. (KTHV) -- The Springdale Fire Department is investigating after buses went up in flames, causing an explosion at a bus canopy at Ozark Regional Transit in Springdale on Tuesday morning.

CBS affiliate 5NEWS in northwest Arkansas reports that when the executive director arrived on the scene around 1:20 a.m., the entire line of buses was engulfed in flames. 20 buses total were destroyed and four roadworthy buses survived.

Two buses were undergoing maintenance at the time of the fire and will be placed back in service in the coming days. One bus was shielded from the fire by another bus, and another was still in route at the time of the fire. These two buses will be in service Tuesday as the new Commuter Express route and the Route 65 in Springdale. All fixed routes will be out of service until further notice.

According to Ozark Regional Transit, all minivans survived the fire and will also be in service. The company said they are working to accommodate as many passengers as possible with this depleted fleet, but all services are subject to interruption, rescheduling and/or cancellation.

“We ask for patience and understanding as we work diligently to recover from this accident,” a press release from ORT stated.

Officers said that no one was injured in the fire and the cause is still under investigation.

Stay with us for more information as it becomes available.