Chinese Vice Foreign Minister Liu Zhenmin summoned Myanmar ambassador Thit Linn Ohn in Beijing last night, lodging solemn representations after the four Chinese were killed.

According to Media report  the bomb hit a sugarcane field in the border city of Lincang and killed four people working there yesterday. 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.

Liu condemned the bombing incident and urged the Myanmar side to thoroughly investigate the case and inform the Chinese side of the result.

He also urged Myanmar 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.

Following the incident, China's Air Force sent fighter jets to patrol the China-Myanmar border in southwestern Yunnan province, a military spokesman said.

The People's Liberation Army Air Force dispatched several batches of fighter jets on Friday to "track, monitor, warn and chase away" Myanmar military planes flying close to the Chinese border, cited air force spokesman Shen Jinke.

He added the air force will take measures to enhance response over the China-Myanmar border in order to "safeguard sovereignty of the national territorial air space".

China's concerns rose as fighting between the rebel National Democratic Alliance Army ( MDAA) headed by ethnic Chinese commander Peng Jiasheng and the Myanmar army intensified in recent months.

Peng had reached a peace accord with the Myanmar government which lasted until 2009. The fighting again started recently prompting Myanmar to seek Chinese assistance to put it down.

The conflict also resulted in several thousand refugees taking shelter in China. A total of 146 people, including 126 Chinese nationals, were arrested in raids on illegal logging that began in January in Myanmar's conflict-stricken northern Kachin state, according to Chinese state media reports.

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