Hundreds of thousands of people around the world staged protests in support of Palestinians in Gaza on Sunday. In Amsterdam, organizers estimated that 250,000 people marched in the rain. Many wore red as a symbolic "red line" against Israel's blockade of Gaza. In Ankara, Turkey, thousands marched, wearing red and chanting in support of intercepted flotilla activists who were trying to bring aid to Gaza. In Karachi, Pakistan, thousands of people marched through the streets carrying pamphlets and flags. --ABC News' Victoria Beaule

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