The police force says a senior officer reviewed the emails and determined there was nothing illegal about them.
The NDP issued a statement Tuesday saying it received two emails during the election campaign that it considered threatening.
The first email accused the party of dominating and manipulating political discussions on Twitter and other social media websites by using automated accounts and paid staff to spread misinformation — allegations the party denies.
One of the emails, which purport to come from the online hacking group Anonymous, said the NDP had 72 hours to stop the alleged tactics or additional information will be released.
Police say the case is closed.
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