DHAKA (AFP) - Bangladesh police said on Friday (Oct 9) that officers had picked up two more people for questioning over the murder of a Japanese farmer, an attack claimed by the Islamist State in Iraq and Syria (ISIS), with two others in custody.

Mr Hoshio Kunio was shot dead last Saturday in the north-western city of Rangpur, the second foreigner to be killed in a week, with ISIS claiming both attacks, although experts are dubious.

Police did not disclose the identity of the pair, but local media said they work in a private bank in Rajshahi city, 15km south of Rangpur.

"Police picked up the two from Rajshahi for questioning over the killing of the Japanese national. They are not formally arrested yet," national police spokesman Nazrul Islam told AFP.

Earlier this week, an opposition activist and a businessman were remanded for ten days in police custody for questioning about Kunio's murder.