Authorities in Beaver County are searching for a missing 4-year-old boy who was last reported seen by his family shortly after 7:30 p.m.

The toddler, Wyatt Smitsky, was last seen by his family outside their home on Georgetown Road in Greene Township.

Police said they believe that the boy may have simply walked away and is lost. They are especially concerned because Wyatt has a congenital heart defect that requires medication.

Authorities have been searching for the boy on ATVs and also have brought in a helicopter to aid in the search.

Wyatt is about four-feet-tall, has a skinny build with blond hair and blue eyes. He was wearing a military-style brown T-shirt, blue shorts and black and red Spiderman flip-flops.

Anyone with information is asked to call state police in Beaver County at 724-773-7400.