Police, fire crews and EMS were on the scene investigating a fatal accident off Solis Road in La Feria around 8:30pm Tuesday.
A witness says one person is believed dead at the scene.
Two vehicles were involved in the accident.
One of those is said to be a flat bed truck hauling palm trees may have been hit by the other vehicle.
Witnesses say one person is in police custody.
An investigation is underway to determine the cause of the accident.