An American religious group in Iran

It's said a group of 23 people (one Brit, the rest Americans) from an American religious group has arrived Tehran on May 7. Resalat, one of the right wing dailies mentions the trip as a ' suspicious trip'. (Let's pray for the safety of the delegation then!:) ) Everybody knows that getting a visa for an American citizen is so tough and takes a lot of time. Since there is a delegation coming, it surely have been negotiations and coordination with the Iranian side. Visiting their webpage, I could see they are working on Iran issue and this trip is one of their efforts to make a change. They say this is their second mission: "The delegation, which will spent 12 days in the country, is part of FOR’s ongoing commitment to working for peace, justice, and the nonviolent resolution of conflict." They are trying to difuse Iran's nuclear crisis without war. The delegation plans to visit Tehran, Shiraz, Isfahan and Qom.

In their webpage, they have some stuff in Persian.

I'm really interested to know how the trip has been organized and at Iranian side, who is backing them. As I said before, this kind of trips never can be fulfilled without a big OK from Iranian side.