LONDON (AP) — One of the British state's biggest contractors collapsed Monday, putting thousands of jobs at risk, after creditors and the government refused to bail out a company struggling under the weight of more than 1.5 billion pounds ($2.1 billion) of debt.

Carillion said it had no choice but to go into compulsory liquidation after weekend talks with creditors failed to get the short-term financing it needed to continue operating. The construction and services company is working on major public works projects, such as the HS2 rail line in northern England, while also maintaining prisons, cleaning hospitals and providing school lunches.

"This is a very sad day for Carillion, for our colleagues, suppliers and customers that we have been proud to serve over many years," Chairman Philip Green said.

The company, which employs some 43,000 people worldwide, has been struggling to reorganize for the past six months amid debts of about 900 million pounds ($1.24 billion) and a pension deficit of 590 million pounds. Carillion's share price has plunged 70 percent in the last six months.

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Britain's government refused to rescue Carillion, saying it could not be expected to bail out a private company. In the meantime, it said it would provide the necessary funding to maintain public services.

"It is of course disappointing that Carillion has become insolvent, but our primary responsibility has always been (to) keep our essential public services running safely," said David Lidington, head of the Cabinet Office.

But questions remain about why the government continued to award contracts to the firm — even after it was having troubles.

"The government must act quickly to bring these public sector contracts back in-house to protect public services and ensure employees, supply chain companies, taxpayers and pension fund members are protected," said lawmaker Jon Trickett of the opposition Labour Party. "Given 2 billion pounds worth of government contracts were awarded in the time three profit warnings were given by Carillion, a serious investigation needs to be launched into the Government's handling of this matter."