Myanmar expressed "deep sorrow" Monday for the deaths of five people across the border in China's Yunnan province that it has been blamed for, while Beijing said it was clear Myanmar's air force was responsible.

China has said a bomb fell from a Myanmar aircraft on a sugarcane field in Yunnan on Friday, killing four people and wounding nine. One of the injured died later.

On Saturday, a senior officer said China's military would take "decisive" measures if there was a repeat attack by Myanmar forces on its territory. Beijing also summoned the Myanmar ambassador to register a protest.