MOSCOW (Reuters) - Russian investigators have amnestied former defence minister Anatoly Serdyukov, Interfax news agency reported on Thursday, citing a source with knowledge of the situation.

Mr Serdyukov, who was sacked as defence minister in November 2012, was being investigated on charges of negligence for using government funds to build a road to a resort.

He had applied for amnesty under an amnesty law passed to mark the 20th anniversary of Russia's constitution, and the request was granted almost immediately, the source told Inferfax.