A small plane crashed into a highway in southern Texas late Tuesday night (local time), sending flames rising from the plane as crews rushed to rescue people trapped inside, the AP reported.The accident occurred shortly after 10 p.m. in downtown Laredo, according to Jose Baeza, an investigator with the local police department. Officials said the plane came down on Loop 20, a major roadway that was later closed in both directions.The number of people on board and the severity of their injuries were not immediately known. Authorities were still working to assess the situation and provide medical aid to those involved.Dramatic video shared online showed the plane lying on its side in front of a highway barrier as flames and smoke surrounded the wreckage. In the footage, emergency responders can be seen running towards the plane and attempting to break the cockpit window in an attempt to rescue those trapped inside.Despite the crash occurring on an active highway, officials said there were no immediate reports of injuries to motorists traveling on Loop 20 at the time of the incident.Emergency crews remained at the scene late into the night while investigators began investigating what may have caused the plane to crash. Authorities have not yet released details about the plane, its flight path or the circumstances of the crash.The Federal Aviation Administration (FAA) and other agencies are expected to investigate the accident. More information about the condition of those on board is awaited.