U.S. Secretary of State John Kerry has held a second round of talks with Iran's foreign minister on the sidelines of an international security conference in Munich.

The State Department said Kerry and Mohammed Javad Zarif met for about 90 minutes early Sunday morning. Details of the discussion were not immediately available, but the pair met last on Friday for two hours during which Kerry pressed Zarif on the Obama administration's desire to meet an end of March target date for the outline of a nuclear agreement.

Negotiations between Iran, the five permanent members of the U.N. Security Council and Germany are to resume soon with an eye toward agreeing on the political framework for a final deal that they hope to reach by the summer.