MAHONING & SHENANGO VALLEYS -   Saturday, May 31, marks the 40th anniversary of a tornado that rocked several Valley communities, including Newton Falls, Lordstown, Niles, and Hubbard in Trumbull County and Wheatland in Mercer County.

This F5 tornado claimed the lives of 12 people in Trumbull County and eight more in Mercer County. More than 500 others were injured, and property damage was estimated at $140 million.

This was the worst of 41 tornadoes that devastated communities from Southern Ontario to Western New York, eastern Ohio, and Western Pennsylvania. It was the only F5 tornado ever recorded in Pennsylvania.

Many of those tornadoes accompanied thunderstorms that formed in the warm sector ahead of an east-moving cold front.

21 News has collected several never-before-seen photos of the tornado's aftermath. We've included those photos below with captions stating where they were taken.

The latest episode of 21 News's podcast, The Radar, offers much more about the tornado and its aftermath.

Taken in Newton Falls
Upside down house in Newton Falls
Taken in Newton Falls
Taken in Newton Falls
Taken in Newton Falls
Crews in Niles checking for people
Fire crews in Niles search the rubble at the roller rink
A Niles firefighter rests after the devastation
Damage at the Niles Roller Rink
Crews search for bodies in Niles at the roller rink
Taken on Chestnut Ridge Road in Hubbard Township
Newton Falls residents return home and see the devastation
Crews in Niles lifting body from rubble
An aerial view of Newton Falls
Another aerial view of Newton Falls
Taken on Route 422 in Niles near roller rink
Taken at a convenience store on SR-46 in Niles
Tanks in Trumbull County
Tank blocks a road in Trumbull County
Taken at a Ford dealership in Newton Falls
Taken on SR-7 in Hubbard Township near White Oak Drive
Taken in Newton Falls in 1990 showing a tree damaged from the storm
Taken at Niles Union Cemetery
A Newton Falls family following the aftermath of the storm
Taken on Cynthia Street in Niles
An aerial view of search and cleanup efforts in Trumbull County
Warren crews search through the rubble
Taken in Mesopotamia Township
Taken in Wheatland, PA in Mercer County
Taken at Valley Baptist Church in Wheatland, PA (Mercer County)
Taken in Wheatland, PA in Mercer County
An aerial view of Wheatland, PA (Mercer County)
Trees damaged in Wheatland, PA in Mercer County
Taken in Wheatland, PA in Mercer County