( CNN ) Myanmar warplanes fighting rebels dropped a bomb at a sugarcane field in China , killing four civilians , the latter 's state media reported Saturday . In addition to the fatalities , nine others were wounded , according to Xinhua news agency . Shortly after the incident Friday , China sent fighter jets to patrol over their shared border . The jets are there to `` track , monitor , warn and chase away '' Myanmar military planes , China 's air force told state media . China summoned Myanmar 's ambassador in Beijing after the incident in the border city of Lincang . Liu Zhenmin , the vice foreign minister for China , called on Myanmar to investigate and bring those behind the attack to justice . Myanmar forces have been battling ethnic separatist rebels in the rugged border region across from Yunnan province . In recent incidents , stray gunfire has damaged property on the Chinese side of the border , prompting Beijing to warn Myanmar to ensure safety . There was no immediate reaction from Myanmar .
China sends fighter jets to patrol over border with turkey following the incident . note : In addition to the fatalities , nine people were injured .