Hillary Clinton on Friday denied that she had dealt with materials marked classified on her personal email account, and forcefully rebuked claims she had mishandled classified information during her time as secretary of state.

In an MSNBC interview, she addressed FBI Director James Comey's recommendation that she not be prosecuted for mishandling classified information despite actions he called "extremely careless."

She said that in her emails, "[t]here were no materials that were marked classified," and added that she had corresponded with hundreds of experienced staffers on her email. She reiterated that she regrets having used a personal email.

In congressional testimony just a day before, Comey said that three of the emails his probe had found were indeed marked classified, although Comey allowed for the possibility that Clinton had not understood the demarcation given he also said they were improperly marked.

Clinton's remarks came after a shooting in Dallas that saw five police offers killed. She had been slated to campaign Friday with Vice President Joe Biden, but canceled the appearance after the shooting.

Earlier in the day, the New York Daily News reported that her Republican opponent, Donald Trump, wanted to come to the New York Police Department's afternoon roll call — a request that was denied by Police Commissioner Bill Bratton. Trump spokesperson Hope Hicks denied to the Daily News that the request was made.