"I will keep stressing the need to stem IS's financial flows and those of all other terrorist organisations," Alfano told a meeting in Rome of Italian tax agents working abroad.
US Secretary of State Rex Tillerson and Kuwait's Deputy Premier and Foreign Minister Sheikh Sabah Khaled al-Hamad Al-Sabah are among those due to attend the anti-IS coalition summit.
The US-lead coalition against the IS was formed in September 2014 and contains 70 partner countries, the Arab League, NATO, the European Union and Interpol.
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