Two infants and three adults were hospitalized Monday after police say they were attacked with a baseball bat on the north side.

The attack happened shortly before 7 p.m. at a home in the 3500 block of Baltimore Avenue, Indianapolis Police Department Sgt. Jim Gillespie said. The neighborhood is near North Keystone Avenue and East 36th Street.

A nine-month-old girl and a two-month-old boy were taken to Riley Hospital for Children at IU Health, while three adults, all 21, were taken to Eskenazi Hospital, Gillespie said.

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It's an American Legion Post like any other.Except it's in a maximum security prison.

Another 22-year-old man was treated at the scene, Gillespie said.

The two month old remained in critical condition Tuesday.

"This was an isolated incident involving family members and acquaintances of the family," Gillespie said in an email. "Detectives are currently working on identifying all parties involved and what their roles were."

Detectives in IMPD's aggravated assault unit are investigating.

Call IndyStar reporter Vic Ryckaert at 317-444-2701. Follow him on Twitter: @VicRyc.