TULSA, Oklahoma - The Tulsa Fire Department is investigating the cause of a house fire in the 4300 block of North Johnstown early Monday.

Firefighters arrived at about 3 a.m. to find flames and smoke coming from the structure.

They say they had to work fast to keep the fire from spreading to a neighboring home.

No one was home and no one was injured in the fire.

No word yet on what caused the fire.