FREMONT, Neb. -- Two young girls, their mother and a man are recovering from injuries they received in a fireworks accident west of Fremont. Dodge County Sheriff Steve Hespen says the girls, ages 2 and 9, and mother suffered injuries to their faces when an improvised firework exploded Wednesday night. 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.