The accused A Lasmaiah, aged around 82, allegedly sexually assaulted the girl twice around five months ago at her house when she was alone in Perakapalli village of the district, they said.
The accused, who is a relative of the victim, used to frequently visit the girl's house. When he found that her parents had gone away for work, he raped her twice, said Bellampalli Circle Inspector A Satyanarayana quoting a complaint lodged by the girl's mother.
"Last week, the girl complained of stomach pain to her mother and when she took her to the hospital, the doctors after medical examination informed that the girl was four-months pregnant," the police officer said.