No one claimed responsibility for the attack late Wednesday in Chuadanga town, 150 kilometers (95 miles) west of the national capital, Dhaka, the area's police chief Mohammad Sarwar said.
Journalists Mahfuz Mamun and Babul Ahmed, both working for local Bengali-language daily Dainik Mathabhanga, were riding to their office together on a bicycle when unidentified attackers hurled the bomb at them, the official said.
Both underwent brief surgery for shrapnel wounds in their legs before being sent home early Thursday, said his colleague Chitta Ranjan.
The journalists were not available for comment.
But police official Sarwar said the two wrote articles in their paper two weeks ago about growing drug trafficking in the town close to the Indian border.
Police investigators were pointing to drug traffickers, Sarwar said, reports the AP.
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