Milon Hossain, a teacher of Piyar Ali School and College, was whisked away on Saturday night, Ashulia Police Station OC Mohsinul Quadir said.

He said Milon was produced before a court that granted police five days to grill him in custody.

Sub-Inspector Selim Reza said Milon, hailing from Lalmonirhat, had worked at Madbar Memorial School in Ashulia.

Milon had helped Ujjal get a job as a teacher of the school, the SI said.

Ujjal was among six attackers killed by security forces to free the cafe siege hostages.

Middle East-based radical group Islamic State published photos of five gunmen and claimed they killed over 20 persons in the cafe.

Ujjal, a madrasa student from Bogra, was among the five ‘IS fighters’.

He had left home six months before the attack, his family said.

Ujjal had told them that he would go to Tabligh Jamaat’s ‘Chilla’, a 40-day travel from one mosque to another to attend lectures and call people to prayers.