War_Conflict

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Vivienne Simon holds up her cuffed hands after she and eight others were arrested for trespassing during a protest against the cutting of trees by the Tennessee Gas Pipeline project Tuesday, May 2, 2017, at the Otis State Forest in Sandisfield, Mass. The protestors did not leave their posts until State police officers and the Berkshire County Sheriff's Department gave them notice and arrested nine people. (Stephanie Zollshan/The Berkshire Eagle via AP)

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Bri Elizabeth and other protesters block one of the main access points for workers on the Tennessee Gas Pipeline project Tuesday, May 2, 2017, at the Otis State Forest in Sandisfield, Mass. The protestors did not leave their posts until State police officers and the Berkshire County Sheriff's Department gave them notice and arrested nine people. (Stephanie Zollshan/The Berkshire Eagle via AP)

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Protestors run a chain across one of the main access points for workers on the Tennessee Gas Pipeline project Tuesday, May 2, 2017, at the Otis State Forest in Sandisfield, Mass. The protestors did not leave their posts until State police officers and the Berkshire County Sheriff's Department gave them notice and arrested nine people. Stephanie Zollshan, The Berkshire Eagle via AP./The Berkshire Eagle via AP)

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Protestors run a chain across one of the main access points for workers on the Tennessee Gas Pipeline project Tuesday, May 2, 2017, at the Otis State Forest in Sandisfield, Mass. The protestors did not leave their posts until State police officers and the Berkshire County Sheriff's Department gave them notice and arrested nine people. Stephanie Zollshan, The Berkshire Eagle via AP./The Berkshire Eagle via AP)

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Protestors run a chain across one of the main access points for workers on the Tennessee Gas Pipeline project Tuesday, May 2, 2017, at the Otis State Forest in Sandisfield, Mass. The protestors did not leave their posts until State police officers and the Berkshire County Sheriff's Department gave them notice and arrested nine people. Stephanie Zollshan, The Berkshire Eagle via AP./The Berkshire Eagle via AP)

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State Police Capt. James Penniman issues a notice of trespassing to protestors who have run a chain across one of the main access points for workers on the Tennessee Gas Pipeline project Tuesday, May 2, 2017, at the Otis State Forest in Sandisfield, Mass. The protestors did not leave their posts until State police officers and the Berkshire County Sheriff's Department gave them notice and arrested nine people. Stephanie Zollshan, The Berkshire Eagle via AP./The Berkshire Eagle via AP)

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Charred and melted debris is still visible on a downtown street corner the day after a May Day march in Portland, Ore., Tuesday, May 2, 2017. May Day protests turned violent in the Pacific Northwest as demonstrators in Portland threw smoke bombs and other objects at police, setting fires in the street while elsewhere thousands of people peacefully marched against President Donald Trump's immigration and labor policies.(AP Photo/Don Ryan)

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Charred and melted debris is still visible on a downtown street corner the day after a May Day march in Portland, Ore., Tuesday, May 2, 2017. May Day protests turned violent in the Pacific Northwest as demonstrators in Portland threw smoke bombs and other objects at police, setting fires in the street while elsewhere thousands of people peacefully marched against President Donald Trump's immigration and labor policies.(AP Photo/Don Ryan)

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In this photo taken April 26, 2017, U.S. Ambassador to China-designate Iowa Gov. Terry Branstad is seen in the Roosevelt Room of the White House in Washington. Branstad pledged Tuesday, May 2, 2017, to confront Beijing on a range of contentious issues, including human rights and trade, and assured lawmakers he’ll push the Chinese to act more aggressively to defuse North Korea’s nuclear weapons program. (AP Photo/Andrew Harnik)

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Mahmoud Abbas comes into the meeting with President Trump very unpopular among Palestinians, who view their leadership as corrupt and are as pessimistic as the Israelis about the prospects for a peace deal. (Associated Press/File)

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In this May 1, 2017 photo, Vietnam War veterans are greeted by thousands of supporters as they return home from the Patriot Productions Honor Flights to Washington during a homecoming celebration at the Lincoln Airport in Lincoln, Neb. More than 600 Vietnam veterans from Nebraska were flown to visit the Vietnam War memorial and pay tribute to their fallen comrades. (Kristin Streff /The Journal-Star via AP)

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In this May 1, 2017 photo, supports welcome the Vietnam War veterans participating in the honor flights during a homecoming celebration on Monday, May 1, 2017, at the Lincoln Airport, in Lincoln, Neb. More than 600 Vietnam veterans from Nebraska were flown to visit the Vietnam War memorial and pay tribute to their fallen comrades. (Kristin Streff /The Journal-Star via AP)

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In this May 1, 2017 photo, Marilyn Dannelly of Genoa holds up signs to greet her husband during a homecoming celebration honoring Vietnam War veterans at the Lincoln Airport in Lincoln, Neb. More than 600 Vietnam veterans from Nebraska were flown to visit the Vietnam War memorial and pay tribute to their fallen comrades. (Kristin Streff /The Journal-Star via AP)

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Seattle Police officers surround a man as they make an arrest, Monday, May 1, 2017, during a May Day protest in Seattle. (AP Photo/Ted S. Warren)

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Seattle Police officers move in to make an arrest, Monday, May 1, 2017, during a May Day protest in Seattle. (AP Photo/Ted S. Warren)

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Protesters argue during a May Day protest, Monday, May 1, 2017, in Seattle. (AP Photo/Ted S. Warren)

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Seattle Police officers make an arrest, Monday, May 1, 2017, during a May Day protest in Seattle. (AP Photo/Ted S. Warren)

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Japan's helicopter carrier Izumo sails in the waters off the Boso Peninsula, east of Tokyo, as it starts to escort a U.S. supply ship after departing Yokosuka port, south of Tokyo, Monday, May 1, 2017. Japan's navy has dispatched its largest destroyer reportedly tasked with escorting U.S. military ships off the Japanese coast, a first-time mission under new security legislation that allows Japan’s military a greater role overseas, amid heightened tension on the Korean Peninsula. (Ren Onuma/Kyodo News via AP)

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Demonstrations on May Day, celebrated as International Workers' Day, follow similar actions worldwide in which protesters from the Philippines to Paris demanded better working conditions.

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Some May Day rallies across the U.S. turned violent. Police were called in to disperse a crowd in downtown Portland, Oregon, Monday after authorities said the protesters had not obtained the proper permits. Marchers then began throwing projectiles at officers, and fires were soon blazing. (Associated Press photographs)