China has accused Indian troops of a "deliberate provocation" in its first official comments on Monday's deadly clash at a disputed Himalayan border.
China's Foreign Ministry says the troops had crossed into Chinese territory and attacked, triggering "fierce physical conflicts".
India's PM Narendra Modi says no foreign soldiers had crossed India's borders and no territory had been lost.
Modi vowed that India would defend its border with military force if necessary.
Twenty Indian soldiers were killed in the clash in the Galwan Valley.
India has said that both sides suffered losses during the fighting.
