A felled tree struck and killed a two-year-old boy and seriously injured his five-year-old brother, after their father cut it down in the family’s La Plata yard, Charles County Sheriff’s officials said.

Officers found the injured boys in the backyard of their home in the 8900 block of Turkey Hill Road about 6:20 p.m., said Diane Richardson, a spokeswoman. Authorities flew the brothers to a hospital, where the two-year-old was later pronounced dead. The older boy was hospitalized in serious condition.

According to the initial investigation, the boys were watching their father cut down the tree from a distance of about 50 feet when the tree suddenly fell toward them, Richardson said.

Police continue to investigate.