SULPHUR, Okla. (AP) — Tornadoes killed four people in Oklahoma and left thousands without power Sunday after a destructive outbreak of severe weather flattened buildings in the heart of one rural town and injured at least 100 people across the state.

More than 20,000 people remained without electricity after tornadoes began late Saturday night. The destruction was extensive in Sulphur, a town of about 5,000 people, where a tornado crumpled many downtown buildings, tossed cars and buses and sheared the roofs off houses across a 15-block radius.

“You just can’t believe the destruction,” Oklahoma Gov. Kevin Stitt said during a visit to the hard-hit town. “It seems like every business downtown has been destroyed.”

Stitt said about 30 people were injured alone in Sulphur, including some who were in a bar as the tornado struck. Hospitals across the state reported about 100 injuries, including people apparently cut or struck by debris or hurt from falls, according to the Oklahoma Department of Emergency Management.