Ugandan rebel forces advanced to the outskirts of Kampala today and an army barracks in the capital was reported shelled.

The developments came a day after Government soldiers went on a rampage in which six people, including four schoolchildren, were killed.

A source in Uganda’s military Government said guerrillas from the National Resistance Army had moved to within three miles of Kampala from positions farther to the southwest.

Foreign Minister Olara Otunnu of Uganda said at a news conference here today that in the last six days the National Resistance Army rebels had mounted an eight-pronged offensive in an attempt to wreck their peace agreement with the Government. The pact, signed Dec. 17, was designed to end a five-year-old civil war.