Three weapons, including Ak-47 rifles, were snatched from a police patrolling party by suspected ULFA militants in upper Assam's Dibrugarh district on Wednesday night.
"Four persons on foot snatched away two AK series assault rifles and a carbine from a six-member police team on routine patrol at Rajgarh township at about 7 pm," superintendent of police Arindam Kalita told PTI.
The insurgents then fled away even as the policemen from 19 Assam Police Battalion (India Reserve) chased them, Kalita said.
Senior police officers have rushed there and investigations are on.
The area has been cordoned off and combing operations launched there to track out them out, he said.
The area was earlier a bastion of ULFA until the leaders of its strike force 28 battalion declared ceasefire nearly three years ago.