"Strongly condemn the suicide attack in Sylhet," she said in a tweet.
"My solidarity with brothers and sisters in Bangladesh," the West Bengal Chief Minister said.
Six persons were killed and nearly 40 others injured, including a top intelligence officer, in two powerful blasts last evening outside a building occupied by the Islamist militants in Sylhet city of Bangladesh.
The first blast had targeted a huge crowd witnessing the operation codenamed 'Twilight' and policemen deployed there, while the second one took place in front of the hideout.
Police had tracked down the Sylhet hideout less than a week after they busted two militant dens on the outskirts of the southeastern port city of Chittagong.
Bangladesh has been witnessing a spate of attacks on secular activists, foreigners and religious minorities since 2013. The country launched a massive crackdown on militants especially after the Dhaka cafe attack.