Democrat presidential nominee Hillary Clinton has slammed the FBI's decision to carry out a new probe into her emails as "strange" and "deeply troubling".

FBI director James Comey announced in a letter to members of Congress on 28 October, that the discovery of new messages had led the bureau to reopen its investigation.

But Clinton has criticised the decision to re-launch the probe, with less than two weeks to go before the presidential election – with the Justice Department reportedly also viewing the timing of the investigation as unusual.

Speaking to volunteers at an event in Daytona Beach, Florida, Clinton said in comments carried by Reuters: "Some of you may have heard about a letter the FBI director sent," adding: "It is pretty strange to put something like that out with such little information right before an election.

"It's not just strange, it's unprecedented and it's deeply troubling because voters deserve to get full and complete facts."

In a previous comment on the subject, the Democrat nominee called on Comey to release all of the information the FBI had immediately.

"We are 11 days out from perhaps the most important national election of our lifetimes," she said.

"Voting is already underway in our country, so the American people deserve to get the full and complete facts immediately.

"So we don't know the facts, which is why we are calling on the FBI to release all the information that it has. Even Director Comey noted that this new information may not be significant, so let's get it out."

Clinton is currently leading her GOP nominee Donald Trump in the majority of the latest polls, although the most recent data has not shown voter reaction since the re-launch of the email probe.

However, she has a lead in nine out of 11 swing states and a current average lead of more than four points on Trump.