An unusual morning home invasion Friday at Chateau Glen subdivision in South Hall County has investigators warning residents to be alert.

The Hall County Sheriff's Office responded to an armed robbery call in the 5700 block of Chateau Glen Drive, off Thompson Mill Road, just before 9 a.m.

There, a 61-year-old female resident told deputies that a Hispanic male knocked on her front door and claimed he had "papers" for her husband, Col. Jeff Strickland said. The man forced his way inside when the woman, home alone at the time, opened the door.

He flashed a handgun and demanded money, deputies said.

The suspect fled with a "small amount of cash," Strickland said, adding that a firearm belonging to residents of the home also was taken.

The victim was unharmed. But investigators are cautioning residents to stay vigilant.

"If someone knocks on the door and you don't recognize them, do not open the door," Strickland said. "Call 911, and we'll respond as quickly as possible and check the person out."

The victim described the assailant to deputies as being Hispanic and in his mid-20s. He's approximately 5 feet 7 inches tall, has a slender build and crew-cut hair. He was wearing a cream-colored sweatshirt with brown stripes and blue jeans, officers said.

And he was last seen in a burgundy-colored, late 1990s model compact SUV, which the victim said may be a GMC Jimmy.

Thus far, there are no similarities between Friday's case and any other robbery calls handled in Hall County the past couple of months, Strickland said.

"That type of home invasion is very rare over there," Strickland said. "This is a fairly nice area that has several homes that have been foreclosed and are vacant. We've not had any other crimes of this nature in the neighborhood."

Anyone with information about the crime is asked to call Sheriff's Office investigators at 770-531-6879.