"They (the Ethiopians) teased him," said Father Afrayim, an Egyptian Coptic monk at the next door Coptic monastery. "They poked him and brought some women who came behind him and pinched him," he said. Each side accuses the other of throwing the first blow in the fist-fight and stone throwing that ensued. Police eventually broke up the brawl but by all accounts many of the protagonists were already wounded.
Perhaps it's something in the water or the air? (via the CoFD)