A grenade explosion took place outside the gates of an Army camp in Tinsukia district of Assam, police said.

However, there was no report of any casualties, a police officer said.

The blast took place in front of the gates of an Army camp at Dirak on Wednesday evening, he said.

"As per our information, two motorcycle-borne persons tried to lob the grenade inside the camp but it fell outside and exploded," he added.

"We are investigating the case and have launched a manhunt to nab the culprits," he added.

From October 1, the application of the Armed Forces (Special Powers) Act, 1958 (AFSPA) was extended in four districts of Assam -- Dibrugarh, Tinsukia, Sivasagar and Charaideo.

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