U.S. Secretary of State John Kerry is reassuring European banks they won't be penalized for conducting or facilitating legitimate business with Iran.

Kerry and British Foreign Secretary Philip Hammond are meeting with key European bankers in London. They're working to clear up what Kerry says are misconceptions about U.S. sanctions on Iran that remain despite the nuclear deal with Tehran.

Kerry says some banks have been reluctant to take what they think is a risk by doing business with Iran. He says the U.S. wants to make clear that as long as banks do their "normal due diligence" to know whom they're doing business with, they won't be held to an undefined or inappropriate standard.

Hammond says there's a gap between U.S. political intentions and the reality for European banks.