A dog has attacked and killed a 7-month-old boy in Dayton, Ohio, on Sunday, media reports said, citing police.

The dog reportedly belonged to the baby’s step-grandmother who was watching the boy for the day. The autopsy results are expected to be released Monday.

The Montgomery County coroner's investigator reportedly said that the child, whose name has not been revealed, was from out of state. Police reportedly responded to the scene after a neighbor called 911 for help.

An American Staffordshire Terrier, also known as Amstaff, which resembles a pit bull, is registered at the address, media reports said, citing records at the Montgomery County Animal Resource Center.

The dog has since been removed from the house by an animal control officer, while the case is being investigated, reports said, adding that, according to a June 3 police report, the same dog had attacked and injured another dog, reportedly a Beagle, which suffered bites on its legs.

The infant's step-grandmother was reportedly found in a state of shock and was unable to walk on her own following the incident. There was no mention of the boy’s parents in the news reports.