BEIJING, March 6 (AFP) - China announced plans Thursday to add harsh anti-terrorism provisions to its Criminal Law after separatist bombings in Xinjiang and Tibet.

"In some places offences in the nature of terrorist activities have been committed and caused enourmous harm making it necessary to include provision to deal telling blows at such offences," Wang Hanbin, vice chairman of the National People's Congress (NPC) told parliament.

He announced draft provisions that would add up to 10 years in prison to any sentence for homicide, explosion or kidnapping carried out as a terrorist act.

In addition, offenders "taking advantage of national or religious problems to instigate the splitting of the State or undermine the unity of the State" will be charged under fierce State Security provisions.

A third charge carrying a three-year term for "enciting ethnic hate" will also be added to the ammendment, Wang added.

The changes, due to be passed next week at the closing session of the NPC, come after a spate of serious ethnic unrest in northwestern Xinjiang which led to the deaths of at least 10 in anti-Chinese rioting and another nine fatalities from bomb attacks on public buses.

According to exiled separatist groups two further bomb attacks have been carried out in the past week one on Saturday in Urumqi at a meeting place for police, and another on Monday on a bus travelling from Yining to the capital.

In neighbouring Tibet, simmering anti-Chinese sentiment led to the bombing of central Lhasa on December 25 and a series of other, uncomfirmed, explosive attacks.

On Tuesday, the chairman of China's Tibetan Autonomous Regional Government, Gyaincain Norbu, warned that separatists in the mountainous region were pushing Tibet towards chaos.

"Separatist activities are a crime which are leading Tibet into disaster," he told NPC delegates.