China's Tibet Autonomous Region has been placed into a state of alert after Nepal reported an outbreak of bird flu last month that has left at least 20,000 chickens dead, local authorities said Friday.

The regional bureau of entry-exit inspection and quarantine has carried out strict health checks in Zham Port on the China-Nepal border and banned the entry of animals and related products susceptible to bird flu, a bureau spokesman said.

Meanwhile, inspection and quarantine staff have been ordered to disinfect all vehicles from Nepal to prevent the spread of epidemic, the spokesman said.

In addition, local authorities have been watching the bird flu situation in Nepal and keeping close contact with Nepalese authorities, he added.

So far, no bird flu has been reported in the Tibetan areas around the Zham Port.