China's air force issued a statement on Saturday saying no Myanmarese jets have entered Chinese territory.

The statement came in response to reports that Myanmarese fighter jets had mistakenly entered China after armed conflict broke out in northern Myanmar.

According to the statement, China's air force has tightened

surveillance over territorial air across the China-Myanmar border since the conflict began. The closest Myanmarese jets are five kilometers away from the border.

Foreign Ministry spokeswoman Hua Chunying confirmed on Friday that three bombs landed in China on the evening of Dec. 30, 2012 during the armed conflict between the Myanmar military and the Kachin Independence Army.

Hua said China made representations to Myanmar afterwards. "The Chinese side demands the Myanmar side immediately take effective measures to prevent similar incidents from happening again."