Armed crooks barged into a Bronx home — zip-tying eight relatives and pistol-whipping one — after an accomplice posed as a delivery person, cops said Friday.

A woman knocked on the door of the Longwood apartment at Southern Boulevard and Leggett Avenue at midnight on Dec. 31, pretending to make a delivery, cops said.

Video shows the woman standing by the door, holding what appears to be a package. Once a 62-year-old resident opened the door, the two crooks immediately ran inside with guns drawn, cops said.

The duo zip-tied eight family members before pistol-whipping a 60-year-old man, cutting his face, according to police. They then swiped $5,500 from the apartment before taking off, cops said.

The suspects fled on foot to Bruckner Boulevard, where they entered a black BMW sedan with dark tinted windows and took off. They were last seen heading south on the Bruckner Boulevard service road, cops said.

The 60-year-old man was taken to Metropolitan Hospital Center, where he was treated and released. There were no other reported injuries.

The female suspect was last seen wearing black sweatpants, a black hooded jacket, black gloves and black sneakers. One man wore black pants, a black jacket, a gray hooded sweatshirt, a black hooded sweatshirt, black gloves and brown boots. The other was wearing black pants and a black fur-lined hooded jacket, police said.