The girl and the 70-year-old accused used to stay in the same apartment building in Dwarka. On the evening of June 11, the accused had inappropriately touched the child while they were in an elevator, a police official said.
She later narrated her ordeal to her parents who approached the police yesterday and subsequently, a case was registered.
After the girl recorded her statement in front of a magistrate today, the accused was arrested, the police said.
"The accused used to live alone as his family stayed abroad," a police officer said.