Iran - United States, a planned war?

Tensions are rising between the United States and Iran, a few days after the attacks on two oil tankers in the Gulf of Oman. Washington accuses the Islamic Republic of being behind the attacks. Teheran, in turn, speaks of an American plot. Could the simmering conflict between these two historic enemies degenerate? And does Switzerland, the diplomatic link between the two countries, have a role to play in defusing the situation?