"The wounded were rushed to the civilian Balad Hospital. Police said that as the Kurdish soldiers drove to the hospital, they fired weapons to clear the way, and one Iraqi Shiite civilian was killed.
Shiite soldiers from another Iraqi unit based in Balad rushed to the scene, and the Kurds decided to take their wounded elsewhere, Iraqi police said. Iraqi troops tried to stop them and shots were fired, killing one Shiite soldier, Iraqi police said.
The U.S. account said an Iraqi soldier from the 3rd Battalion, 1st Brigade was killed in a "confrontation" as the other Iraqi troops were trying to remove their wounded from the hospital. Associated Press
This is the problem with "national" armies made up of the forces of the ethnic nations which make up the population of a multi-national state. Unless the army involved is formed under the "boot" of an authoritarian figure who will allow no ethnic foolishness, these forces nearly always break down into their essential identities under serious stress.
The Kurds in this story were originally Kurdish Pesh Merga. The Shia were whatever they were.
In 1984 the US tried to re-make the Lebanese Army to transform it into the "backbone" of a new, united Lebanon. A variety of formulae were attempted for the purpose of "bringing Lebanon together again." Mixed units were tried. Ethno-religiously "pure" units were tried. Everything looked good so long as none of these units were stressed by forcing them into combat. The US Command in Beirut reported that all was well. The usual "can-do" attitude prevailed in reporting from the American trainers in Lebanon. Then one fine day it was necessary to begin to commit some of these troops to action against adversaries of the government. It was then discovered that the soldiers involved would not fight their co-religionists. Quite soon it was clear that this was generally true throughout the country. US policy goals in Lebanon were "scaled back" soon after that.
Having tried to "referee" between an ethnic Cambodian scout battalion and another battalion of Vietnamese Rangers while they shot it out for an hour, I was not surprised at what happened in Lebanon and I am not surprised now.
The "insult" which started that fight had to do with "national" diet.