A Lafayette firefighter was injured after being forced over the ledge of an overpass when a semi-truck hit a nearby firetruck.

The Lafayette Fire Department was on the scene Thursday night of a crash on Interstate 10 westbound near the Interstate 49 split. The firetruck was parked on the road while fire personnel helped with that crash, said Lafayette Police Department spokesperson Sgt. Robin Green.

The driver of an 18-wheeler hit the parked truck at about 9:30 p.m. while firefighters were standing nearby. While trying to escape the impact of the firetruck, one firefighter was forced over the ledge of a nearby overpass, Green said.

The 45-year-old firefighter, who is not being identified but has been with the department for 4 years, landed on the cement 20 feet below, said fire department spokesperson Alton Trahan said. He sustained severe injuries and was taken to a nearby hospital.

The 51-year-old driver of the semi-truck was arrested and charged with failure to yield to an emergency vehicle, open alcohol container, operating while under the influence - first offense, and vehicular negligent injuring.