Campaign group Human Rights Watch (HRW) has called for an investigation into a series of massacres in Beni in the east of the Democratic Republic of Congo which has left more than 1,000 people dead over the past four years.

The rights group says over 200 civilians have been killed this year - many were hacked to death with machetes or were shot dead.

It wants the International Criminal Court and UN peacekeepers to investigate and prosecute those responsible.

DR Congo officials blame the violence on Ugandan rebels but HRW says other armed groups as well as Congolese army officers are involved.

It says the attacks are complicating efforts to tackle the Ebola outbreak in eastern DR Congo which has killed more than 100 people since August.