BEIJING (AP) — China says a shell from fighting between Burma’s army and guerrillas fell into its territory this week, but caused no casualties.

A Chinese Foreign Ministry spokesman said Thursday that China expressed its strong dissatisfaction to Burma about Tuesday’s incident and urged it to take measures to prevent it from happening again.

Spokesman Hong Lei says the shell landed in Chinese territory about 500 meters (yards) from the border with Burma.

Intermittent fighting between Burma’s army and the Kachin rebels escalated in December. The rebels’ headquarters are located in a town near the border. Burma’s army fired artillery shells into Laiza town on Monday, killing three civilians according to the rebels.

Hong says China calls on the two sides to cease fire and resolve their dispute through dialogue.