WHITEHALL TWP., Pa. -

Authorities are investigating a fast-moving blaze that shut down a Perkins restaurant in Whitehall Twp., Lehigh Co.

The fire broke out around 5:30 p.m. Sunday inside the restaurant at 1450 MacArthur Rd.

"There was a lot of fire on the roof. I was surprised to see that much fire," said Chief Robert Benner, Whitehall Fire Co.

"It's really chaotic with all of the fire trucks, ambulances, and emergency vehicles. The top of the right side of the building was really bad. It was just fully engulfed in flames," said Meghan Springer, a witness.

All five employees and 12 guests were able to get out of the burning building uninjured, according to Vivian Brooks, a Perkins spokeswoman.

One firefighter was taken to the hospital after pinching his hand on a ladder, according to Benner.

The fire was contained mostly to the roof and most of the damage was caused by the water, Benner said. Crews were able to put out the fire in about 30 minutes.

Officials said the fire was likely electrical, but the investigation is ongoing. Investigators were expected to return to the scene Monday morning.

The restaurant will be closed for a least a few weeks.

Perkins released the following statement:

"The Whitehall Perkins, located at 1450 MacArthur Road, is closed until further notice as a result of a fire that occurred Sunday evening at approximately 5:30 p.m. All guests and employees were safely evacuated from the restaurant with no injuries. We are very grateful for the quick response and hard work of the fire department and the fact that no one was harmed. We appreciate the community's patience as we learn more about the extent of damage to the building and determine exactly when the restaurant can be reopened."