Lightning struck a metal canopy and injured 21 soldiers who were standing under it at a National Guard (search) weapons training range.

Only one of the injured soldiers, a sergeant who was knocked unconscious, was admitted to a hospital after the strike Sunday night.

Sgt. Richard Sandt, 36, is expected to be discharged Monday, Guard spokesman Lt. Col. Chris Cleaver said. Most of the soldiers who were at the training range were from a Kutztown-based infantry company.

About 100 soldiers had been firing weapons at the M-16 (search) range when the exercise was stopped about 8:30 p.m. because of the storm. The soldiers were under a pavilion waiting to board a bus when the lightning struck.