Story highlights Ananta Bijoy Das, 32, was killed Tuesday morning as he left his home

Das' death was at least the third this year of a blogger

(CNN) Attacks on bloggers critical of Islam have taken on a disturbing regularity in Bangladesh, with yet another writer hacked to death Tuesday.

Ananta Bijoy Das, 32, was killed Tuesday morning as he left his home on his way to work at a bank, police in the northeastern Bangladeshi city of Sylhet said.

Four masked men attacked him, hacking him to death with cleavers and machetes, said Sylhet Metropolitan Police Commissioner Kamrul Ahsan.

The men then ran away. Because of the time of the morning when the attack happened, there were few witnesses. But police say they are following up on interviewing the few people who saw the incident.

"It's one after another after another," said Imran Sarker, who heads the Blogger and Online Activists Network in Bangladesh. "It's the same scenario again and again. It's very troubling."

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