The six Gulf states sharpened their tone against Iran on Tuesday, demanding an immediate halt to its "interference" in their internal affairs while urging a rapid political transition in its ally Syria, AFP reported.

Concluding a two-day summit in Manama, the Gulf Cooperation Council members voiced support for Bahrain's Sunni minority regime while lashing out at Tehran, which they accuse of fueling a Shiite-led uprising in the host country last year.