An 82-year-old woman was robbed at gunpoint by two men who broke into her Brooklyn apartment and stole $8,400 in cash and a bag “full of cigarettes,” authorities said Friday.

The elderly woman was inside her home at NYCHA’s Bay View Houses in Canarsie about 3 p.m. on Aug. 2 when two men knocked on her door, police said.

When she opened it, the pair pulled out a gun and pushed their way into the home, demanding money.

The crooks then grabbed thousands of dollars in cash and a duffel bag full of cigarettes before fleeing on foot, officials said.

The woman was not injured.