The policemen were attacked when they were moving in a bus carrying ration for the security forces engaged in counter insurgency operations in the district in the early hours today, IG (Operations) G H P Raju said.
Two of the constables who were in the bus suffered bullet injuries and were rushed to the Williamnagar district civil hospital, he said.
District police chief Anand Mishra rushed to the site with additional commandos and a counter operation was launched.
The attack came within 24 hours of the security forces shooting dead a wanted GNLA cadre in South West Garo Hills district and busted their makeshift camp.