BEIJING, March 13 -- Chinese Vice Foreign Minister Liu Zhenmin summoned Myanmar ambassador Thit Linn Ohn in Beijing Friday night, lodging solemn representations to him after four Chinese people were killed by a bomb dropped by a Myanmar warplane in southwestern Yunnan Province.

The bomb hit a sugarcane field in the border city of Lincang and killed four people working there on Friday afternoon. Nine others were also injured.

Earlier this week, the Chinese foreign ministry said that stray fire from a fight that occurred on Sunday between Myanmar's government forces and a local ethnic army had damaged a house in China.

On Friday, Liu condemned the incident in the sugarcane field and urged the Myanmar side to thoroughly investigate the case and inform the Chinese side of the result.

He also urged the Myanmar side to punish the perpetrator, appropriately handle the aftermath, and take immediate and effective measures to prevent recurrence of such incidents and safeguard the security and stability in the border areas between China and Myanmar.