An autopsy has been carried out on the body of a Japanese man who was gunned down in Bangladesh, hospital sources said Sunday.

A team from the forensic medicine department of Rangpur Medical College examined Kunio Hoshi's body on Sunday afternoon and is expected to announce its findings on Sunday evening.

Hoshi, believed to be 65 or 66, was shot Saturday by masked gunmen in broad daylight while traveling in the northern district of Rangpur at around 11 a.m.

The Islamic State militant group has reportedly claimed responsibility for the killing.

Hoshi's death came just days after the murder of Italian national Cesare Tavella in Dhaka, with IS claiming responsibility for that attack, too.

But the Bangladesh government said it had found no links to the Islamist group.

Home Minister Asaduzzaman Khan said the two murders "are identical," but he went on to claim that the militant group has no presence in the country.

Hoshi arrived in Bangladesh around the first week of February and got involved in an agricultural project under which he grew and developed a new variety of Napier grass on 2 acres of leased land around 5 km from the town of Rangpur.

Local media said Saturday that three or four people had been detained in connection with the attack.