The incident happened on Saturday morning. Family members were identified as Chandrasekar Sundara, 44; Lavanya Sunkara, 41; and two boys aged 15 and 10, CNN reported.
Police have found multiple shots in the victims.
"We continue to work through this investigation, and we will continue until we answer as many questions as we can," said Sergeant Dan Wade with West De Moine's police department.
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