NEW DELHI: Bangladesh police have charged seven people including a senior opposition official over the murder of an Italian aid worker last September, an officer said on Tuesday. The killing near the capital’s diplomatic zone was the first in a wave of attacks to be claimed by the Islamic State group, and was followed days later by the gunning down of a Japanese farmer in northern Bangladesh. Bangladesh authorities rejected the IS claim of responsibility, saying the group had no presence in the country. The government and police say homegrown militants are responsible for the deaths of nearly 50 secular activists, foreigners and religious minorities killed over the last three years. They say the deaths are part of a plot to destabilize the country, and have blamed the main opposition Bangladesh Nationalist Party and its Islamist ally.