The Qinghai Taxation Bureau discovered 1,154 fake invoices worth 128 million yuan ($18.7 million), people.com.cn, the website of People's Daily, reported Monday. The invoices were used to evade roughly 4.94 million yuan ($700,000) in taxes.

The invoices were discovered during an inspection of a double track construction project on the Qinghai-Tibet railway. About 20 companies and individuals are involved.

The Qinghai-Tibet railway runs 1,956 km across the frozen tundra of the Qinghai-Tibet Plateau, from Lhasa, capital of the Tibet Autonomous Region, to Xining, capital of the neighboring Qinghai Province.