The head of the Federal Bureau of Investigation sought to calm fears that Russians or others could electronically sabotage the nation’s election in November, saying the 50-state voting system is so dispersed and “clunky’’ it would be difficult for hackers to affect the outcome.

Appearing at a panel with other senior U.S. intelligence officials Thursday, FBI Director James Comey was asked about the concerns that hackers acting on behalf of the Russian government might try to manipulate the presidential election.

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