Beijing prosecutors called on banks to review credit card applications more carefully, a move prompted by a recent spike in fraud.

Credit card fraud accounted for most of the more than 1,000 economic crime cases that courts in the national capital dealt with from 2010 to 2012, and prosecutors expect the number to keep rising.

Failing to pay balances was the most common offense, while most of the others involved fraudulent credit card applications, the city procuratorate said.

In the past two years, the Chaoyang district has prosecuted 660 people suspected of credit card fraud, while the Xicheng district has prosecuted 264.

"Credit card fraud boomed in 2012 along with our district's fast economic development," said Lu Junzhao, director of financial crime for Xicheng's prosecuting authority.

He said reports of the crime last year were nine times what they were in 2011.

Nearly two-thirds of defendants were unemployed but were able to apply for cards without providing all the required documentation, a key reason for the spike in fraud, he said.

Zhu Haiyan, a prosecutor in Dongcheng district, said people without fixed incomes were the biggest offenders.

Although banks do have strict procedures for credit card applications, many employees have eased qualifications for applicants or even failed to verify identities, Zhu said.