article_snippet.sent: The sides are still talking.
article_snippet.sent: U.S. State Department official Marie Harf said on Twitter that talks between Kerry and Zarif ran deep into the early hours of Thursday morning.
article_snippet.sent: That was truly an all-nighter," U.S. State Department official Marie Harf tweeted around 6 a.m. local time (12 a.m. ET), saying the negotiations had broken up and would resume again in a few hours.
article_snippet.sent: As long as "the conversations continue to be productive," White House press secretary Josh Earnest said, U.S. officials will keep on talking.
article_snippet.sent: the sides have oftentimes talked past each other for nine years.
article_snippet.sent: The military option will remain on the table," U.S. Defense Secretary Ashton Carter told NBC's "Today" show on Tuesday.
highlights_snippet.sent: Talks run until early Thursday morning; expected to resume hours later .
  