DHAKA: Bangladesh police Tuesday charged five suspected Islamist militants for the murder of an atheist blogger, one of four secular writers hacked to death this year for writing against fundamentalists.

Police brought the charges ─ the first in any of the four murders this year ─ in a Dhaka magistrates court, which will now decide whether to open a trial or order further investigations.

"We've submitted a charge sheet against five people for the murder of blogger Washiqur Rahman. The five were charged with murder," Dhaka police spokesman Muntashirul Islam told AFP.

"They include an organiser of the Ansarullah Bangla Team (ABT) and four others who are its supporters," he said, referring to a banned local Islamist militant group which police have blamed in all four murders.

Washiqur Rahman, 27, an atheist blogger who wrote under a pen name on Facebook against religious fundamentalism ─ especially Islam and Islamist radicals ─ was killed near his home in Dhaka in March.

Know more: Another blogger hacked to death in Bangladesh: police

Two of the suspects, students of a madrasa, were tackled by local transgenders ─ known as "hijras" in the sub-continent ─ as they tried to flee the scene. They held them until police made arrests.

Rahman's death came just weeks after a Bangladesh-born American atheist blogger was murdered in the Bangladeshi capital by machete-wielding attackers.

Know more: US blogger hacked to death in Dhaka

"The organiser of ABT, Hasibur Rahman, also known as Abdullah, recruited the other four and trained them for nearly three months for the specific purpose of murdering Washiqur," said additional deputy police commissioner Saiful Islam.

"They rented a room in Dhaka's Jatrabari neighbourhood for this purpose and carried out reconnaissance on Rahman for two days before the murder," he said, adding three of the alleged killers were arrested by police, while Abdullah had absconded and the fifth was still at large.

The government of Prime Minister Sheikh Hasina has come under fire for not doing enough to protect atheist and rationalist writers.

In August police arrested seven suspected Islamists including a British citizen of Bangladeshi origin for the murder of two other atheist bloggers.

Read more: More arrests in bloggers' killings in Bangladesh