The FBI and London metropolitan police each investigate fewer than 100 contract killings per year, on average.

美国联邦调查局(FBI)和伦敦警察局平均每年各自调查不到100起雇凶杀人案件。

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Some estimate that, at the peak of Russia's crime wave in the 1990s, there were around 1, 000 contract killings per year.

据估计，俄罗斯在1990年代的犯罪高峰期，每年大约发生1 000起雇凶杀人案件。

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The interior minister, Rumen Petkov, has just been forced to resign, after the 120th in a string of unsolved contract killings; he has admitted being in contact with suspected crime bosses.

在该国第120起尚未侦破的连环雇佣杀人案发生后，曾承认与涉嫌犯罪团伙首脑有过接触的内政部长Rumen Petkov刚刚被迫辞职。

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Neither this nor any other of Russia's most famous contract killings has been solved.

FORBES: Godfather of the Kremlin?

In 2010 it emerged that guards at a jail in Durango had allowed prisoners out at night to commit contract killings.

ECONOMIST: Prisons in Latin America

The Bulgarian government did sack one of its most controversial figures in April: Rumen Petkov, an interior minister known to have had meetings with organised-crime bosses (he insists that he was trying to stop the contract killings).

ECONOMIST: Bulgarian corruption