The 16 IEDs, planted by outlawed Garo National Liberation Army militants, were seized at Pathalgre village. They were targetted at the security forces, IG (Operations) G H P Raju said.
He said a special team of the state police commandos also busted the camp of the outfit in the Durama hills range in the district.
Yesterday, the police teams recovered 47 IEDs and successfully diffused them besides several Molotov cocktails from the area where the operation is on.
Formed in 2010, the GNLA is active in all five districts in the Garo Hills region and in part of West Khasi Hills district and has been involved in kidnapping, killing and extortion.