The cancellation is a blow to tentative hopes that the rivals were about to improve ties following years of rising hostility.
North Korea said it wasn't sending its officials to Seoul for the two-day meeting that was to begin yesterday because the South had changed the head of its delegation, Kim Hyung-suk, a spokesman for Seoul's Unification Ministry, told reporters in a briefing. The ministry is in charge of North Korea matters.
South Korea had originally wanted a minister-level meeting between the top officials for each country's inter-Korean affairs agency, but Pyongyang wouldn't commit to that. The last minister-level meeting between the Koreas occurred in December 2007.
When Seoul told Pyongyang today that it was sending a lower-level official than it had initially proposed in preparatory talks, North Korea said it would consider that a "provocation," Kim said.
"The two sides are offended by each other now. The relations may again undergo a cooling-off period before negotiations for further talks resume," he said.
North Korea did not immediately issue its own statement about the canceled talks.
The talks were set up in a painstaking 17-hour negotiating session Sunday, but the rivals had set aside the question of who would lead each delegation. Kim said that today, North Korea offered to send a senior official of the Committee for the Peaceful Reunification of Korea as chief delegate, and Seoul said it would send its vice unification minister as chief delegate.
