DHAKA, Bangladesh — A blogger who wrote for a website that promoted secularism was hacked to death on Tuesday by a group of four men, a police official said. It was the third fatal attack on a Bangladeshi blogger since February.

Four men chased the blogger, Ananta Bijoy Dash, through streets near his home in the northeastern city of Sylhet and attacked him, said Mohammad Rahamat Ullah, a police official in Sylhet. No arrests have been made, Mr. Ullah said.

The assailants walked away after the attack, leaving Mr. Dash’s body near a pond, Mr. Ullah said.

The attack was disturbingly familiar. Mr. Dash had written for Free Mind, a website that the Bangladeshi-American blogger Avijit Roy had moderated before being killed in February by machete-wielding assailants while leaving a book fair in Dhaka, the capital.

Five weeks after Mr. Roy’s death, another blogger, Oyasiqur Rhaman, was killed by three men with machetes in Dhaka. The deaths recalled the 2013 killing in Dhaka of the blogger Ahmed Rajib Haider.