Security cameras covered with red cloth are seen outside the Museum of the First National Congress of the Chinese Communist Party, as China's President Xi Jinping visits the museum, in Shanghai, China, October 31, 2017. REUTERS/Aly Song

FAIRFAX, VA - OCTOBER 31: Dressed as a ninja, Shaheer Sarwar, from Pakistan, takes the oath of U.S citizenship with other children during a Halloween-themed citizenship ceremony October 31, 2017 in Fairfax, Virginia. Thirty-one children ages 2-12 and representing 22 countries took part in the ceremony while obtaining their U.S. citizenship at the U.S. Citizenship and Immigration Services office in Fairfax. Win McNamee/Getty Images/AFP == FOR NEWSPAPERS, INTERNET, TELCOS & TELEVISION USE ONLY ==

Paris Saint-Germain's Brazilian forward Neymar celebrates after scoring a goal during the UEFA Champions League Group B football match between Paris Saint-Germain (PSG) and Anderlecht (RSCA) on October 31, 2017, at the Parc des Princes stadium in Paris. / AFP / FRANCK FIFE

People in scary Halloween costumes wait at the train station before participating in the zombie walk in Essen, Germany, Tuesday, Oct. 31, 2017. Hundreds of young people celebrate Halloween at Germany's biggest horror walk through the city center of Essen. (AP Photo/Martin Meissner)

A paramedic looks at a body covered under a white sheet along the bike path Tuesday Oct. 31, 2017, in New York. A motorist drove onto a busy bicycle path near the World Trade Center memorial and struck several people Tuesday, police and witnesses said. (AP Photo/Bebeto Matthews)

A woman with a child takes part in a March of the Mummies protest for better protections and support for working mothers returning to work after giving birth, in London, Tuesday, Oct. 31, 2017. The protest Tuesday, was organised by the "Pregnant Then Screwed" organisation. (AP Photo/Matt Dunham)

ATTENTION EDITORS - VISUAL COVERAGE OF SCENES OF INJURY OR DEATH Afghan policemen carry an injured person after a blast in Kabul, Afghanistan October 31, 2017. REUTERS/Mohammad Ismail TEMPLATE OUT

New York City Police Officers respond to report of gunfire along West Street near the pedestrian bridge at Stuyvesant High School in lower Manhattan in New York, Tuesday, Oct. 31, 2017. (Martin Speechley/NYPD via AP)

Colin Stretch, general counsel with Facebook Inc., left, and and Sean Edgett, acting general counsel with Twitter Inc., arrive to a Senate Judiciary Crime and Terrorism Subcommittee hearing in Washington, D.C., U.S., on Tuesday, Oct. 31, 2017 Congress is putting Facebook, Twitter and Google under a public microscope about Russia's use of their networks to meddle in the 2016 election, a day after Special Counsel Robert Mueller's criminal investigation disclosed its first indictments and guilty plea. Photographer: Andrew Harrer/Bloomberg

BRU1. BRUSELAS (B…LGICA), 31/10/2017.- El expresidente de la Generalitat de CataluÒa Carles Puigdemont (i) llega al club de la prensa en Bruselas para comparecer ante los medios de comunicaciÛn, en Bruselas, BÈlgica, hoy 31 de octubre de 2017. Puigdemont llegÛ este lunes a Bruselas despuÈs de que el fiscal general del Estado de EspaÒa, JosÈ Manuel Maza, anunciara una querella por rebeliÛn, sediciÛn y malversaciÛn contra Èl y el resto del gobierno regional, asÌ como otra querella contra la mesa del Parlamento autÛnomo. EFE/ Stephanie Lecocq

ATTENTION EDITORS - VISUAL COVERAGE OF SCENES OF INJURY OR DEATH Ali Johar, 35, holds the hand of his daughter Minara, 4, who died after a boat with Rohingya refugees fleeing from Myanmar capsized, at a hospital in Shamlapur near Cox’s Bazar, Bangladesh October 31, 2017. REUTERS/Adnan Abidi TEMPLATE OUT TPX IMAGES OF THE DAY

ATS01. BEL…N (PALESTINA), 31/10/2017.- Varios soldados israelÌes patrullan junto a un grafitti del presidente estadounidense, el republicano Donald Trump, y el primer ministro israelÌ Benjamin Netanyahu realizados por el artista Lushsux, en el muro fronterizo con Israel, en BelÈn (Palestina) hoy, 31 de octubre de 2017. EFE/ Atef Safadi

Prima ballerina Deborah Ribeiro, soloist of the Rio De Janeiro's Municipal Theatre, performs during a protest of the theatre's artists against the non-payment of their salaries and the economic crisis in Rio de Janeiro, Brazil October 31, 2017. REUTERS/Ricardo Moraes