(AP) — Two young girls, their mother and a man are recovering from injuries they received in a fireworks accident west of Fremont.

The Dodge County sheriff said that the girls, ages 2 and 9, and mother suffered injuries to their faces when an improvised firework exploded Wednesday night.

Sheriff Steve Hespen says people were taking apart mortar shells and packing the powder into a cannon. A stick or wooden rod used to pack the powder ended up serving as a projectile when something ignited the powder, sending wooden shrapnel out from the firework.

An adult male also was hurt. The four were taken to a hospital, but details on their conditions were not immediately available.