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

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

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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).

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