MOSCOW (Reuters) - The mayor of a small city near Moscow was shot dead on Monday in what appeared to be a contract killing, investigators said, soon after he aired corruption allegations against local officials and businessmen. Yevgeny Dushko, the mayor of Sergiyev Posad, was shot twice as he left his home for work, the Russian state Investigative Committee said on its website. "The killing can be linked to the official's work as well as to his previous entrepreneurial activity. The way the crime was committed also suggests it was a contract killing," added the committee, a law enforcement agency independent of the police.