BRUSSELS) - The United States is concerned Iranian appeals to European courts could loosen sanctions against Tehran, said a State Department official on Monday who urged the EU to urgently find a way to allow judges to examine secret intelligence evidence.Europe's General Court told EU governments in January to lift asset freezes against Bank Mellat and Bank Saderat, two of more than a dozen Iranian banks which the European Union says are helping finance Tehran's nuclear programme.Both the European Union and the United States view sanctions against the Iranian banking sector as a crucial component of economic pressure designed to force Tehran to scale back the nuclear work, which they suspect has covert military goals.