Creditors of ailing STX Offshore & Shipbuilding on Friday injected an additional 250 billion won (US$216 million) in liquidity into the shipbuilder in a bid to tide it over during its cash crunch, officials said.

Main creditor Korea Development Bank (KDB) said that the creditors pumped the emergency funds to STX Group's troubled shipbuilder following the injection of 600 billion won made in late April.

"The creditors plan to finalize comprehensive measures to normalize the company's operations by end-July," KDB said in a statement. "The creditors could take proactive actions including further liquidity injection even before the measures come out."

STX Group, the country's 13th-biggest conglomerate, has seen its major affiliates struggling from liquidity shortages and mounting debt due to the downturn in the shipbuilding and shipping sectors.

KDB and other creditors have agreed to pump more than 1 trillion won into STX Group in return for overhaul efforts.

STX Group's holding company STX Corp. and three ailing units -- STX Offshore & Shipbuilding, STX Heavy Industries and STX Engine -- have requested that creditor banks supply liquidity.

Industry watchers previously projected that more than 2 trillion won in additional funds may be needed to help STX Group survive. The sheer volume of possible liquidity injections compares with local banks' combined first-quarter earnings of 1.8 trillion won.

The group's shipping line STX Pan Ocean Co. applied for bankruptcy filing on June 7 due to mounting debt and losses stemming from falling freight rates and an oversupply of ships.

STX Group had a combined 2.86 trillion won in corporate debt to be paid out by 2015, according to NICE Investors Service, a local credit appraiser. Out of such debt, the group has 580 billion won in debt that is due this year.