Photographer: Alexander Koerner/Getty Images
Photographer: Alexander Koerner/Getty Images

In Pictures: The World Mourns After Brussels Blasts

Terrorism has once again reared its head in Europe, leaving dozens dead, Brussels in lockdown and the world reeling. Following the trio of rush-hour blasts, EU leaders pledged to stand together and fight the scourge of terror, while tributes poured in from leaders around the world.

A young girl lights a candle at the Place de la Bourse in Brussels following the attacks.

Photographer: Carl Court/Getty Images

Locals and tourists gather at Beursplein square in Brussels.

Photographer: Alexander Koerner/Getty Images

Candles burn at the Place de la Bourse in Brussels.

Photographer: Carl Court/Getty Images

Forensic police units and investigators search in the Wetstraat - Rue de la Loi in Brussels, which was evacuated following the bomb blasts.

Photographer: Nicolas Maeterlinck/AFP via Getty Images

Belgian Prime Minister Charles Michel lights a candle at the Place de la Bourse to pay tribute to the victims of the attacks as European Commission President Jean-Claude Juncker, center right, looks on.

Photographer: Etienne Ansotte/European Commission via EPA

U.S. President Barack Obama, with daughters Malia, Sasha and first lady Michelle Obama, stands next to Cuban President Raul Castro as they observe a moment of silence for the victims of the terror attacks in Brussels, prior to a friendly baseball game between the Tampa Bay Rays and the Cuban National team in Havana, Cuba.

Photographer: Sven Creutzmann/Mambo Photo via Getty Images

The Belgian flag is projected on the Trevi Fountain in Rome.

Photographer: Gabriel Bouys/AFP via Getty Images

A man holds a placard that translates as "I AM BRUSSELS" in front of the Hotel de Ville in Paris as people gather for a tribute to the victims of the Brussels attack.

Photographer: Martin Bureau/AFP via Getty Images

People gather in front of the Hotel de Ville displaying Belgian flags in Paris.

Photographer: Martin Bureau/AFP via Getty Images

Police officers guard a street at the Schaarbeek neighborhood in Brussels following a search at a house.

Photographer: Alexander Koerner/Getty Images

A woman writes a message on a wall at a memorial in tribute to victims of the terrorist attacks in Brussels.

Photographer: Emmanuel Dunand/AFP via Getty Images

Heavily armed police patrol the streets of lower Manhattan in New York following a heightened terror alert after attacks in Brussels.

Photographer: Spencer Platt/Getty Images

A man lays flowers at the steps of the Belgian Embassy in Berlin.

Photographer: Sean Gallup/Getty Images

German Chancellor Angela Merkel speaks at a news conference in Berlin following the Brussels attacks.

Photographer: Florian Gaertner/Photothek via Getty Images

The Royal Palace at Dam Square in Amsterdam displays the colors of the Belgian flag.

Photographer: Evert Elzinga/AFP via Getty Images

People hold a banner reading in French and Flemish "I AM BRUSSELS" as they gather around a memorial in front of the Bourse of Brussels.

Photographer: Aurore Belot/AFP via Getty Images

A boy wearing a Belgian flag stands under the Eiffel Tower in Paris.

Photographer: Lionel Bonaventure/AFP via Getty Images