Investigations are underway into the purchase of dozens of prepaid cell phones at three Missouri Walmart stores this week.

Macon County Sheriff’s deputies have turned information over to the FBI about a large of quantity of cell phones purchased at the Wal Mart in Macon.

Dozens of prepaid phones were also purchased Friday and Saturday at Walmarts in Columbia and Lebanon.

Sheriff’s deputies in LaClede County spoke with the two men who bought about 60 cell phones at the Lebanon Walmart, had no legal reason to detain the men and let them go.

Prepaid phones are harder for law enforcement to track, and have been used to trigger explosive devises.