Iran nuclear negotiators resume talks after crashing through March deadline for deal

British Foreign Secretary Philip Hammond, left, U.S. Secretary of State John Kerry, right, and U.S. Robert Malley, center, Senior Director for Iran, Iraq, and the Gulf States, National Security Council speak during a break outside the hotel at the Beau Rivage Palace Hotel as the Iran nuclear talks continue, in Lausanne, Switzerland, Wednesday, April 1, 2015. (AP Photo/Keystone,Laurent Gillieron) (The Associated Press)

U.S. Secretary of State John Kerry, front left, walks during a break outside the Beau Rivage Palace Hotel as the Iran nuclear talks continue, in Lausanne, Switzerland, Wednesday, April 1, 2015. (AP Photo/Keystone,Laurent Gillieron) (The Associated Press)

US Secretary of State John Kerry looks at the view of Lake Geneva from his hotel room as the Iran nuclear talks continue in Lausanne, Switzerland, Wednesday, April 1, 2015. Negotiations over Iran’s nuclear program resumed Wednesday but were almost immediately beset by competing claims, just hours after diplomats abandoned a March 31 deadline to reach the outline of a deal and agreeing to press on. (AP Photo/Keystone, Laurent Gillieron) (The Associated Press)

Nuclear talks between Iran and six world powers are resuming, hours after negotiators abandoned a March 31 deadline to produce the outline of an agreement.

Claiming enough progress had been made in six days of intense bartering to warrant an extension, foreign ministers or their representatives from the five permanent U.N. Security Council members and Germany pressed ahead Wednesday with efforts to bridge significant gaps and hammer out details of a framework accord. If they succeed, those understandings would form the basis for a comprehensive agreement to be reached by the end of June.

After the talks last broke in the early hours Wednesday, Iran's foreign minister said solutions to many of the problems had been found and that documents attesting to that would soon be drafted. Other officials were more skeptical.