Galvanized by the pillaging of Britain’s Embassy in Tehran, Western nations moved Thursday to significantly tighten sanctions against Iran over its suspect nuclear program, with the European Union expanding an Iranian blacklist and the United States Senate passing a measure that could severely disrupt Iran’s oil income.

The European Union added 180 names to a roster of Iranian officials and companies whose assets have been frozen and are banned from travel to member states. While that action fell short of demands by Britain and France for an embargo on oil purchases from Iran, one of the world’s leading producers, ministers meeting in Brussels said they would consider such a restriction in coming weeks.