Mohammad Al Abdallah, the executive director of the Syria Justice and Accountability Centre, shows a video that was posted to YouTube of illegal cluster bombing in Syria. Meredith Rizzo/NPR hide caption

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Meredith Rizzo/NPR

Activists Build Human Rights Abuse Cases With Help From Cellphone Videos

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The camp at Mungote is one of the largest for internally displaced persons in the Democratic Republic of Congo, with over 12,000 residents who fled their homes due to ongoing conflict and violence. Giles Clarke/Getty Images hide caption

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Giles Clarke/Getty Images

Turkish President Recep Tayyip Erdogan attends a summit in Beijing on Monday. He'll travel to Washington on Tuesday to meet with President Trump and discuss strategy for the fight against terrorism in Syria, which has divided the two countries. Lintao Zhang/AP hide caption

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Lintao Zhang/AP

This image — taken via satellite in January 2015 — depicts what the State Department says is the crematorium at Saydnaya prison, including snowmelt on the facility's roof that acting Assistant Secretary of State for Near East Affairs Stuart Jones says is proof of the building's higher temperature. State Department/DigitalGlobe hide caption

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State Department/DigitalGlobe

Members of the Syrian Democratic Forces look toward Tabqa, Syria. The U.S. announced Tuesday that it will begin arming Kurds allied with the SDF as the Pentagon prepares an offensive to retake the ISIS stronghold Raqqa. Syrian Democratic Forces via AP hide caption

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Syrian Democratic Forces via AP

Syrian Foreign Minister Walid al-Moallem holds a news conference in the capital, Damascus, on Monday. Louai Beshara /AFP/Getty Images hide caption

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Louai Beshara /AFP/Getty Images

Treasury Secretary Steven Mnuchin talks to reporters during Monday's press briefing at the White House. Mnuchin announced sanctions against 271 employees of Syria's Scientific Studies and Research Center. Chip Somodevilla/Getty Images hide caption

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Chip Somodevilla/Getty Images

A picture taken April 16 shows the damage a day after a suicide car bombing attack in Rashidin, west of Aleppo, targeted buses carrying Syrians evacuated from Fuaa and Kafraya, two besieged Shiite villages. Omar Haj Kadour/AFP/Getty Images hide caption

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Omar Haj Kadour/AFP/Getty Images

White House press secretary Sean Spicer waits for an interview on Tuesday to speak about a comparison he made between Syria's President Bashar Assad and Hitler during an earlier press briefing at the White House. Brendan Smialowski/AFP/Getty Images hide caption

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Brendan Smialowski/AFP/Getty Images