A Saturday night fire in a three-story apartment building in south Minneapolis sent two adults and two children to the hospital for possible smoke inhalation, according to the Minneapolis Fire Department.

Minneapolis Fire crews found black smoke and fire visible in a second-story window at 2747 Stevens Av. S., in Minneapolis' Whittier neighborhood, around 10:30 p.m.

The apartment that burned has been declared uninhabitable. The Red Cross was called on to assist residents of the unit above the one where the fire was centered; three adults and a child were displaced because of the blaze, according to Minneapolis Fire.

The fire reportedly singed the hair of those hospitalized.

The cause of the fire is under investigation. Residents said there was a small explosion before the fire started.