Indianapolis police are searching for three suspects after two women and three children, including an infant, were shot Sunday evening in a townhome on the city's northwest side.

Police responded to the shooting at around 9:30 p.m. local time. Indianapolis police Lt. Richard Riddle told the Associated Press that the three children injured in the shooting were aged 6, 3, and 6 months.

All five victims were hospitalized in serious condition. The relationship between the victims was not immediately known and no identifying information was available.

A police statement early Monday said authorities were seeking three suspects who fled the complex in a vehicle after the attack, but that a motive was unclear.

"This does not seem to be a random act of violence, and the detectives believe the parties involved knew each other," the statement said.

Detectives told WXIN that they were looking for a white or gray sedan that was seen speeding away from the home after shooting.

Riddle says another man, who was not hit by the gunfire, witnessed the shooting. He added that there was no sign of forced entry into the house, and police believe at least one person inside knew the suspects.

The Associated Press contributed to this report.

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