WATERTOWN, S.D.(KWAT)- Four people(3 are children) were sent to the hospital, two of them with serious injuries, following an early Wednesday morning house fire in Watertown.

The fire was in a two story home at 525 3rd Street Southwest.

Adam Heinrich (hine-rick) is a lieutenant with Watertown Fire Rescue.

The cause of the fire will be under investigation.

Heinrich says the fire rekindled on the second floor of the home early this morning, sending crews back to the home for a second time.