DHAKA, Bangladesh—Another Bangladeshi blogger was hacked to death in Dhaka on Friday—the fourth such attack on writers who had been critical of Islam this year—raising renewed fears about growing radicalization in the South Asian country.

Police and family members said 40-year-old Niloy Chattopadhyay, who wrote under the pen name Niloy Neel, was killed by machete-wielding assailants who entered his home in the capital on Friday afternoon.

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