Russia's RIA Novosti news agency, quoting an unidentified source, said the plane likely crashed because of a technical malfunction or pilot error.

俄罗斯的俄新社引述一个没有公布身份的消息来源的话说，飞机坠毁的原因可能是技术故障或者是飞行员操作失误所致。

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In this case, a leading possibility is that the signal originates from an unusual modulation between a GPS satellite and an unidentified Earth-based source.

在这种情况下，最主要的可能性是这道信号来源于一个一颗GPS卫星和未确认的地球发射源之间的不寻常的调制信号。

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The Interfax news agency cited an unidentified medical source as saying he had died of heart failure.

国际通讯社引用了一个未证实的医学报告指出他可能死于心脏衰竭。

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Last week, a report from veteran U.S. television journalist Dan Rather described Chavez's health situation as "dire, " citing an unidentified source's assessment that the Venezuelan president may not see the final results of the October elections due to the progression of his cancer.

CNN: Venezuela's Chavez appears chipper, energetic on state TV

Reid's unsubstantiated claim, based on an unidentified source, was intended to keep alive the push by Democrats to force Romney to release more of his past tax returns than the two years disclosed so far -- his 2010 filing and an estimate for 2011.

CNN: Presidential campaign gets even dirtier

According to the Reuters news agency, which quoted an unidentified government source, Germany is very close to lifting its growth forecasts.

BBC: NEWS | Business | French and German growth picks up