Kerry, in town of Sharm el-Sheikh in Egypt, said the purpose of the Iran talks was "not just to get any deal, it is to get the right deal", AFP reports.

"We made some progress, but there are still some gaps, important gaps."

Six world powers -- Britain, China, France, Russia, the United States and Germany -- aim by the end of this month to nail down the outline of a deal to solve disagreement on iran civilian nuclear activities.

"The deadline is approaching. Time is critical," said Kerry."We continue to remain focussed on reaching the right deal."
The parties hope to reach a full accord by July 1.

Iran's supreme leader, Grand Ayatollah Seyed Ali Khamenei, has criticized the negotiations. On Thursday supreme leader said the other side in the talks was "deceitful and stabs in the back".

From Sharm el-Sheikh, Kerry will travel to the Swiss city of Lausanne to meet Iranian Foreign Minister Mohammad Javad Zarif.

The US negotiating team, including chief negotiator Under Secretary of State Wendy Sherman and Energy Secretary Ernest Moniz, are scheduled to join him in Lausanne.

"I want to be very clear. Nothing in our deliberations is decided until everything is decided," said Kerry.

"President (Barack) Obama means it when he says again and again that Iran will not permitted to get a nuclear weapon."
World powers remain focused on getting the "right deal," he said.

"We still don't know whether or not we will get there and that's why I travel to Lausanne ... in order to meet with Foreign Minister Zarif and once again engage in talks to see if we can find a way to get that right deal."