(ONN) – Cleveland police say a suspect is behind bars for the killings of four people, including two children.

Police say the man, whose identity is currently being withheld, has been booked on aggravated murder charges.

The two children found dead Tuesday in a house were a 2-year-old girl and 6-year-old boy.

Autopsies show they died of smoke inhalation.

25-year-old Takeyra Collins, who lived in the home and was also found there, died of gunshots.

35-year-old David Cousin Jr. also was found fatally shot in a vacant lot near the house.

Family members say Cousin and Collins were neighbors but didn’t really know each other.