System outages at several Chinese banks since the weekend have exacerbated concerns amongst the public about a credit crunch, after the central bank tightened the availability of funds in the banking system as it tries to rein in informal lending.
A money transfer system at Bank of China (BOC) , the country's third largest lender, temporarily failed on Monday, and some customers at Bank of Nanjing also could not transfer money this week.
On Sunday, a nationwide outage of automatic tell machines (ATMs) and Point of Sales (POS) machines at China's biggest bank, Industrial and Commercial Bank of China (ICBC) , were tweeted across China's popular Twitter-like Weibo.
BOC, Bank of Nanjing and ICBC have all said the outages were due to technical problems, but this did not allay customer concerns of a larger problem in the banking sector.
"I cannot withdraw money from ICBC and BOC, and don't know who will be next," wrote blogger Wang Yangyu.
"Can you banks give me a better explanation?"
Seeking to cut off funding to the unregulated "shadow banking" market, the central bank has not added significantly to the supply of cash recently, forcing short-term interest rates -- the price of borrowing money -- to rise sharply last week.
Interbank rates have moderated this week, but banking shares have fallen sharply over the past two days.