The United Nations is investigating reports of a massacre by Ugandan rebels in the Democratic Republic of Congo. A senior UN official says as many as 100 people were killed in the alleged attack, which is believed to have taken place in February. After visiting the remote town of Niangara, near the site of the alleged killings, the UN humanitarian chief, Mr. John Holmes said if the claims are true it would bring the number of people killed between December and March to more than 500. Mr Holmes said rebels from the Lord's Resistance Army had carried out the massacre in the village of Kpanga in the north-east of the country, near the border with southern Sudan and the Central African Republic. <br/>