China on Tuesday said foreign diplomats in Beijing were "shocked" over the "illegal trespass" into Chinese territory by Indian troops.
An article in a state run Chinese daily has warned that if India stirs up conflicts in several spots then the consequences of that could be going for an all-out confrontation.
The People's Liberation Army has carried out a live-fire, brigade-level military exercise on the Tibet plateau which borders India.
Both India and China strengthened their troops in the area in June, with each side adding about 3,000 soldiers.
The video also showed anti-tank missiles being used to strike bunkers and twin-barrel anti-aircraft guns for air defense.
The Chinese river Yarlung Zangbo which enters India through Arunachal, where it is called Siang before it becomes the Brahmaputra in Assam.
Lu said China "also stressed that facts are very clear in this incident". Separately, Tibet's mobile communication agency conducted a drill on July 10 in Lhasa, the capital of Tibet, where members practised setting up a temporary mobile network to secure communications in an emergency, the Global Times reported.
The report said the brigade has new types of weapons after a structural reform this year, improving its combat capability so that it is stronger than before.
China had earlier said that there is "no room" for negotiations to resolve the military face-off and the only solution is the withdrawal of Indian troops from the Donglang or Doklam region. The location was not far from where Chinese and Indian forces remain locked in a stand-off over a disputed border area at the tri-junction with Bhutan.
The deployment of Indian troops to the area infuriated China, which retaliated by closing a nearby mountain pass that Indian pilgrims use to reach Mount Kailash, a sacred Hindu and Buddhist site in Tibet.
The opinion piece said that India's plans of devoting more resources at border would evoke a reaction from China. New Delhi has accused Beijing of compromising the security of India and neighboring Bhutan by expanding Chinese infrastructure close to the border.
China doesn't recognize the land under the actual control of India is Indian territory.