A 70-year-old woman was raped at gunpoint inside her Bronx apartment building, police said Tuesday.

The shocking sexual assault unfolded around 2 a.m. July 27 when the woman entered the stairwell of her building in Belmont and was approached by an unknown man from behind, cops said.

The man, wearing a black mask and another red plastic face covering, pulled out a firearm and raped the woman, cops said.

The man then fled.

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The woman did not report the attack until Monday and was treated for injures at BronxCare Health System Hospital, cops said.

Police released surveillance footage Tuesday of her suspected attacker.

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