(L-R) US Secretary of State John Kerry, European Union Foreign Policy Chief Catherine Ashton, and Iran's Foreign Minister Mohammad Javad Zarif are photographed as they participate in a trilateral meeting in Vienna October 15, 2014. [Photo/Agencies]

VIENNA - A senior US official said after high-level nuclear talks with Iran on Wednesday that some progress continued to be made but much work remained to be done, adding the goal was still to reach a deal by a late November deadline.

The State Department official spoke after about six hours of talks between US Secretary of State John Kerry, Iranian Foreign Minister Mohammad Javad Zarif and European Union foreign policy chief Catherine Ashton in Vienna.

"We've been chipping away at some of the issues. Everybody has put ideas on the table to see if we can move the ball forward," the official said. "We have and continue to make some progress but there's a substantial amount of work to be done."

Iran and six world powers - the United States, France, Germany, China, Russia and Britain - aim to end a decade-old nuclear standoff by a self-imposed Nov 24 deadline.