Four South Philadelphia people were terrorized and pistol-whipped during a violent home invasion and robbery early Sunday.

None was seriously injured, Philadelphia police said.

According to police, a 23-year-old man was upstairs in the house on the 2000 block of Mifflin Street with his girlfriend, also 23, when he heard a knock on the door around 12:45 a.m.

He man opened the door, only to be rushed by two men with handguns and wearing ski masks.

"Where's the money? Where's the money?" both offenders shouted repeatedly, as one pistol-whipped the man.

The assailants then forced the man upstairs into the front bedroom, and one held him at gunpoint.

The other entered the back bedroom, where the woman was, pointed a silvered handgun at her, and asked repeatedly, "Where's the money?"

The frightened woman said, "I have nothing." The assailant ordered her to stuff a laptop and video-game consoles into a plastic trash bag.

Telling the woman to hurry, the man smacked her with his gun twice in the back of the head.

After the woman bagged up the items, the assailant forced her to join her boyfriend and the other assailant in the front room.

Soon after, the couple's roommate, also 23, entered the house with a friend, 18.

One of the assailants pointed his gun at both people. The second assailant joined him, and both newcomers were pistol-whipped and taken upstairs to the front room.

The offenders then ransacked the second floor, police said without providing details.

The assailants then fled. Both were described as African American, one in a green hooded sweatshirt, the other in dark clothes.