Officers say six cows shot on two neighboring properties weeks apart in Oklahoma may be connected and it’s possible the shooter has killed other animals in the area.

Police in Choctaw, Okla., are investigating the shootings, assisted by reward money from the Humane Society of the United States and Harry Waldrip, the owner of a cow and three calves lost in an incident.

The Oklahoman reports two cows were shot dead on May 21 while a second shooting in mid-July resulted in three calves and a mother cow lost. Choctaw Police Chief Conny Clay told the Oklahoman  the shootings may also be related to two horses shot in the same area.

Authorities are considering all leads in finding the suspects but no primary suspect has been identified. A $2,500 reward is offered by the HSUS and Waldrip is offering a $1,000 reward to find the suspect who he says is likely “a kid with no guidance and too much spare time.”

Two additional cows shot recently may also be tied to the same suspect.