DHAKA, July 4 (Reuters) - Suspected tribal rebels believed to be holding a kidnapped Bangladeshi working for Danish development agency Danida have slipped out of a cordon laid by Bangladesh security forces, police said.

In a sudden raid on a hideout on Wednesday, security forces recovered only some utensils and cooking materials, thought to have been left behind by the abductors.

The Danida staffer, Suman Sharif, was kidnapped along with his driver on June 25 at a village near Thanchi, some 400 km (250 miles) southeast of the capital Dhaka. The motive was unknown.

"They might have slipped away with Suman, eluding the raiders," said a police officer, who asked not to be identified.

"It would be really difficult to free the victim if the abductors can slip away across the border," he said.

Kidnappers released the driver two days later at a remote forest in the wake of a massive security hunt for the abducted men.

Authorities have deployed over 1,000 security forces including army commandos to scoured heavy forests for the missing man.

Police have so far detained some 30 people, including 10 Myanmar citizens, in connection to the case.

Thanchi is a township in the Chittagong Hill Tracts (CHT) adjacent to Tripura and Mizoram, which are eastern states of India, and Arakah (Rakhaine) state in western Myanmar.

Various rebel groups have been active in these states for decades on different issues, intelligence sources say.

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