ZHENGZHOU -- Thirteen suspects in a cross-border telecom scam based in Cambodia were brought back to China by police from Luoyang City in Central China's Henan province Sunday.

Police said the gang extorted money from victims in China using the Internet.

Police began to trace the fraudsters in June after an extortion case was uncovered in Luoyang, involving 346,000 yuan (52,000 U.S. dollars).

Since then police have found the gang extorted money from over 1,000 victims nationwide, involving fraud of 13 million yuan.

Sino-Cambodian police forces moved in on the gang in Cambodia's capital Phnom Penh, arresting 31 members, with 28 of them Chinese nationals.

Police brought 13 of the gang members back to Luoyang for further investigation.