Chinese banks have ramped up their borrowing of short-term funds, a sign that fears of a cash crunch still loom large even as Beijing sought to calm traders after a recent liquidity squeeze.

Onshore lenders this week doubled their issuance of so-called negotiable certificates of deposit, a form of debt with maturities from one to 12 months, to more than 1 trillion yuan ($137 billion). That’s the largest weekly issuance of such debt on record, according to data compiled by Bloomberg.