The latest incident occurred in Dinajpur district, 415 km (260 miles) north of the capital Dhaka when a series of bombs exploded as hundreds of devotees attended a religious ceremony known as "Rushmela", Abdul Mazid, the officer in-charge of Kahalur police station, told Reuters.
The attack came after recent threats to the temple`s priest, urging him not to organize any religious gatherings, Mazid said.
Five people had been detained for interrogation, he said.
Bomb attacks on Hindu religious gatherings are rare in Muslim-majority Bangladesh.
The country has suffered a rising tide of Islamist violence over the past year. Four online critics of religious militancy have been hacked to death, among them a U.S. citizen of Bangladesh origin.
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