The United Nations Security Council later imposed sanctions on Pyongyang, which have impeded its efforts to sell conventional weapons abroad, a major source of income for the cash-strapped nation.

VOA: standard.2009.12.08

Bank of America is still dealing with its legacy mortgage issues which have been a regular source of concern for the company over the last 3 years.

FORBES: Taking Stock of Bank of America's Mortgage Business

Samples of the oil have also been sent for testing to try and trace its source.

BBC: Oil taking toll on sea birds

PCs have been both Compaq's source of strength and its greatest weakness.

FORBES: Desktop battle plan