Two Mineral Point firefighters were killed in a crash with a semi-trailer truck on Highway 151 early Thursday morning, authorities reported.

The crash happened about 12:30 a.m. on Highway 151 near mile marker 38 when a Mineral Point fire truck was responding to a report of a crash in that area, the Iowa County Sheriff’s Office said in a statement on its Facebook page.

The northbound fire truck, which had two firefighters on board, was attempting to turn into an emergency crossover when it was struck by a northbound semi that also was northbound on 151, the Sheriff’s Office said.

The firetruck caught fire and both vehicles sustained heavy damage in the crash, the Sheriff’s Office said.

Both firefighters were killed in the crash, while the driver of the semi was uninjured.

Fire Captain Brian C. Busch and Firefighter James “Jim” Ludlum were both killed in the crash.