Congo clashes
DR Congo authorities ban Kinshasa rallies over tensions
Tshisekedi was elected in December to replace Kabila who presided over sub-Saharan Africa's biggest country for nearly two decades.
Kabila’s critics and some analysts say concerns about his personal security and the fortune reportedly amassed by his family could account for a seeming reluctance to cede power.
Conflict between Hema and Lendu around the turn of the century killed tens of thousands of people.
Prime Minister Bruno Tshibala told Reuters in an interview during a visit to London that he did not expect that would lead to changes in the law.
Catholic activists had called for protests after Sunday mass, one year after President Joseph Kabila committed to holding an election to choose his successor by the end of 2017.
The delay has fueled suspicions Kabila will try to remove constitutional term limits that forbid him from running again.
Congo’s government has banned opposition demonstrations since last year, when security forces killed dozens of protesters demanding Kabila’s departure.
A Congolese military spokesman had earlier confirmed that the bodies had been discovered near the road, but did not know how many there were.
The fighting is a fresh outbreak of violence for a region plagued by ethnic tensions and massacres that killed more than 800 people between 2014-2016.
UN peacekeepers helped beat them back with heavy machineguns after some government troops fled, with UN helicopters sinking several rebel boats.
UN Secretary-General Antonio Guterres set up an internal board of inquiry and gave an executive summary of the findings to the Security Council on Tuesday.
Violence has raged across much of Congo killing hundreds and displacing millions amid a political crisis caused by President Kabila's refusal to step down.
Another rights group, Amnesty International, said later that more than 100 people had been arrested.
However, UN investigators say they cannot yet lay blame for the murders based on the preliminary evidence.
Kidnapping of locals & Westerners for ransom has been on the rise in eastern DRC, a tinderbox of rebel groups & militias left over from a 1998-2003 war.
The assailants were not identified, but witnesses said they wore red headbands and magic charms.
Kabila’s refusal to step down at the end of his second elected term in December sparked protests that killed dozens of people.
An adviser to Kabila told Reuters earlier the government would not hold its annual independence day military parade on Friday because of security concerns.
But witnesses in Kasai-Central interviewed in March by Reuters said they had seen army trucks dumping bodies.