LANZHOU, Dec. 17 -- Police in northwest China's Gansu Province have seized four suspects in an international manhunt since July, a senior police officer said Wednesday.

"Gansu has targeted 17 fugitive suspects in eight countries including the United States, South Africa and Singapore," said Xue Yutang with the provincial public security bureau, who is in charge of investigating business-related crimes.

Another 13 suspects are still at large, Xue added.

China launched the Fox Hunt 2014 operation in July to "block the last route of retreat" for corrupt officials at a time when China's major crackdown on graft has already narrowed the space for abuse of power.

As of Dec. 4, a total of 428 fugitive suspects from more than 60 countries and regions have been captured. The campaign will last until the end of this year.