DHAKA: Bangladesh police said Monday they have arrested four people in connection with the murder of an Italian aid worker who was shot dead last month in an attack claimed by the Islamic State group. “We have arrested four people in connection with the murder of Cesare Tavella. Three of them were his killers,” Dhaka police spokesman Muntashirul Islam told AFP. The 50-year-old Tavella was shot dead on September 28 near Dhaka’s diplomatic zone, one of a series of recent attacks which have been claimed by IS. A Japanese farmer was also murdered by gunmen in northern Bangladesh less than a week after Tavella’s killing.