10 people -- including three children -- were killed in a house fire in Pennsylvania, state police say - CNN

The three children killed were identified as two boys, ages 5 and 6, and a girl, age 7.

"We are utilizing multiple department assets to ensure a thorough and complete investigation into this fatal fire," Felsman said.

The house was "completely destroyed," by the blaze, state police said.

When asked whether authorities were conducting a criminal investigation into the blaze, Felsman responded that "it's a fire investigation at this time."

The cause of the fire is under investigation, Luzerne County District Attorney Sam Sanguedolce told CNN.

"Should the fire marshals determine the cause to be intentional and incendiary, we would begin a criminal investigation for arson," he said.

Pennsylvania Gov.