Suspected Islamist militants stabbed to death a Hindu priest at a temple in Bangladesh on Sunday, and shot and wounded a devotee who went to his aid.
Police said the attack was perpetrated by a local militant group, while Islamic State claimed responsibility in a statement issued via social media.
Bangladesh has experienced a wave of militant violence in recent months, including a series of bomb attacks on mosques and Hindu temples.
Some of the attacks have been claimed by Islamic State, which has said it was behind the killings of a Japanese citizen, an Italian aid worker and a policeman.
In Sunday's incident, five or six attackers cut the throat of the priest, Jogeshwar Roy, 55, as he was organizing prayers at the Deviganj temple near Panchagar, 494 km (308 miles) north of Dhaka, police said.
Police have arrested four people who are members of the Jamaatul Mujahedeen Bangladesh (JMB), police official Humayun Kabir said, rejecting the claim by Islamic State, which was issued through the Telegram messaging app and Twitter.
"In a security operation facilitated by the almighty God, soldiers of the Caliphate liquidated the priest Jogeshwar Roy, the founder and the head of the Deviganj temple that belongs to the infidel Hindus," the Islamic State statement read in Arabic.
"One of his companions was hurt after being targeted with light weapons in the area of Panchagar in Northern Bangladesh, and the Mujahideen returned to their positions unharmed, and all praise be to God."
The devotee who tried to stop the priest's attackers was shot in the leg before the group fled, Kabir said.
The government denies that Islamic State has a presence in the country of 160 million people. Police have blamed earlier attacks on home-grown Islamist militants.