Two anti-terrorism exercises were held at the railway station and the Gonggar airport in Lhasa, capital of the Tibet Autonomous Region Monday.

The exercises, code-named "Plateau Guards 2012," were held simultaneously at 4 pm and lasted more than an hour, according to local media.

The authority simulated twin terrorist attacks, in which "terrorists" attacked the railway station and the airport, hijacking an aircraft and a train. Police, firefighters and other rescue workers arrived at the sites to successfully defeat the attackers.

"Plateau Guards 2011" was held in June last year.

The region held the anti-terrorism drill in preparation for the upcoming 18th National Congress of the Communist Party of China, Xiong Kunxin, a professor with the Minzu University of China, told the Global Times.

"Hostile forces will consider the 18th National Congress a time to sabotage the security and social stability of the country," said Xiong.

Xiong said Tibet faces terrorism threats from within and outside the country.

The Dalai clique and hostile forces in the West hope to bring China into widespread chaos, Xiong warned.

He also warned  that outside infiltrators and some people incited by the Dalai clique may launch terrorist attacks in the region.