The signing ceremony of the protocol to the agreement between Iran and the US will be held in Switzerland, at a luxury hotel in Bürgenstock, a mountain resort overlooking Lake Lucerne, the Swiss Foreign Ministry told the French Agency Tuesday.

"At present, this signature is scheduled for Friday, June 19th in Bürgenstock," the ministry told the French Agency.

The site is located in the centre of Switzerland is difficult to access and therefore quite safe. It was proposed by Pakistanis and Qatari ombudsmen as well as by the US and Iran, the ministry still says.