Federal Bureau of Investigation Director James Comey said Tuesday the FBI believes no charges are appropriate in the case over whether Hillary Clinton mishandled classified information while serving as secretary of state.
On Saturday, the presumptive Democratic presidential nominee met with FBI investigators for three hours to discuss the private email server that she used for official business.
Comey said that although there is evidence of potential violations,"our judgement is that no reasonable prosecutor would bring such a case."
Clinton's campaign reportedly was "pleased with FBI findings," the Associated Press reported on Twitter, noting the campaign called it a "mistake" for Clinton to have used personal email as the secretary.
Comey said Clinton used several different servers and numerous mobile devices for personal and work emails.
The FBI read all 30,000 emails in the probe.
Presumptive Republican presidential nominee Donald Trump reacted to Comey's press conference on Twitter, saying the system is "rigged" and "unfair."
Comey said 110 emails in 52 email chains were determined to contain classified information at the time they were sent. He said eight email chains contained information that was top secret.
According to Comey, investigators found no evidence that Clinton purposely deleted any work-related emails. But he added that Clinton and her staff "were extremely careless in their handling of highly classified information."
Comey said it was possible that hostile actors gained access to Clinton's email account. He said Clinton used private servers "extensively" in other countries.
Clinton explained that she used the email account hosted on a private computer server, instead of her official email account hosted on a government server, because she wanted to ensure her private correspondence remained secure. Outside analysts have said using such a server was less secure than the one provided by the government.
In two recent public opinion polls, roughly two-thirds of respondents doubted her honesty or expressed concerns about her trustworthiness.
It's a stumbling block Clinton herself has acknowledged.
"A lot of people tell pollsters they don't trust me. I don't like hearing that, and I've thought a lot about what's behind it," she said at a campaign event last week. "I take this seriously, as someone who is asking for your votes, and I personally know I have work to do on this point."
Republicans have long sought to exploit what they see as one of Clinton's core weaknesses, with Trump referring to her as "crooked Hillary" and others alleging she has received special treatment.
Key dates in email case
Jan. 13, 2009: Clintonemail.com domain is established.
Jan. 21, 2009: Senate confirms Clinton as secretary of state.
Feb. 17, 2009: National Security Agency and tech experts warn Clinton chief of staff Cheryl Mills against boss using private BlackBerry and server, citing hacking risks.
March 18, 2009: Date Clinton later says marks start of her using server.
Sept. 11, 2012: Extremists attack U.S. compound in Benghazi, Libya, killing four Americans including U.S. ambassador Chris Stevens.
October 2012: Accountability Review Board assesses State Department's Benghazi response, at Clinton's behest.
March 2, 2015: The New York Times reports on Clinton's use of private email server as secretary.
March 10, 2015: Clinton defends using server for "convenience."
July 24, 2015: State Department and national security officials ask Justice Department to review whether Clinton's private email use compromised classified information.
Aug. 11, 2015: Clinton's campaign says she turned over records to Justice Department.
May 25, 2016: State Department's inspector general issues report criticizing Clinton's private email use, citing 2005 requirement to use government computers.
July 1, 2016: Attorney General Loretta Lynch - trying to tamp down conflict-of-interest accusations after visit with former president Bill Clinton at airport in Phoenix, Arizona, says she'll abide by FBI recommendation on email case.
July 2, 2016: FBI interviews Clinton for 3 ? hours at FBI headquarters in Washington.
July 5, 2016: FBI Director James Comey announces decision not to bring charges.
Some information for this report was compiled from the Associated Press, The Washington Post, USA Today and the website of investigative journalist Sharyl Atkisson.