The Ministry of Foreign Affairs urged countries where Chinese fugitives are hiding to discard prejudice and work more closely with China in its massive anti-graft drive, a senior official said on Wednesday.

China has concluded 39 extradition treaties with countries, and 29 are in effect, said Xu Hong, director-general of the ministry's Department of Treaty and Law.

Of the 52 criminal judicial assistance treaties that China has signed with countries, 46 are in force, but "tremendous challenges" remain, he said at a news briefing in Beijing.