Diplomats say the U.S., Britain, France and Germany now seek to refer Iran to the U.N. Iran said the vessel was entering the strait. Key points and original sources are listed below.

• Diplomats say the U.S., Britain, France and Germany now seek to refer Iran to the U.N. Security Council for failure to comply with its nuclear nonproliferation obligations.S1

• Iran said the vessel was entering the strait.S2