At least 37 people have been killed in fighting in just three days this week in Chad, President Idriss Deby has said.
“We are witnessing a terrible phenomenon,” Mr Deby told journalists on the country’s independence day.
“The intercommunal conflict has become a national concern,” he added, blaming an influx of weapons from conflicts in neighbouring countries such as Libya, Nigeria, Sudan, DR Congo and the Central African Republic.
The latest killings happened in Ouaddie in eastern Chad close to the Sudanese border.
The AFP news agency reports that rivalry over land between local farmers and nomadic camel herders has been intensifying in recent years partly due to worsening droughts.