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The investigation into bomb blasts in the heart of the European Union continues Wednesday as people across the globe try to make sense of the attacks.
At least 31 people died when suicide bombers struck at Brussels Airport and the Maelbeek Metro station on Tuesday, authorities said.
Here are things to know in the aftermath of the attacks:
Brothers identified as suicide bombers
On Wednesday morning, a Belgian federal prosecutor named Khalid and Ibrahim El Bakraoui as the suicide bombers involved in Tuesday's deadly attacks.
During a press conference, prosecutor Frederic Van Leeuw said Khalid El Bakraoui detonated a bomb at the Maelbeek Metro station while his brother detonated a bomb at Brussels Airport. Both men had criminal records, although neither had been linked to terrorism before Tuesday.
Search continues for bomb maker
Multiple outlets reported suspected bomb maker Najim Laachraoui was arrested in relation to Tuesday's attacks, however, those reports were later shot down by Van Leeuw.
Local reports have identified Laachraoui as one of three men seen on CCTV footage taken from the airport and released by authorities in the wake of the attacks. Authorities have not confirmed Laachraoui was involved. He is believed to be a bomb maker for ISIS and has been linked to the November terrorist attacks in Paris.
Authorities are still investigating links between the Paris and Belgium attacks.
1 arrested in connection to attacks
Anti-terror police arrested one person in a raid in Brussels' Anderlecht district Wednesday, according to BBC News. The suspect's identity and suspected connection to the bombings were not immediately clear.
Peruvian woman killed in blast
The first person confirmed dead in the attacks was identified by family members as Adelma Tapia Ruiz, 36. She was at Brussels Airport with her 3-year-old twin daughters and husband, en route to New York, when the blasts shook the airport, according to the New York Times.
She had lived in Brussels for years. Her husband and one of her daughters suffered injuries in the attack.
Hundreds injured, multiple people missing
Van Leeuw said about 270 people suffered injuries in the attacks. The injured include three American missionaries and 19 Portuguese, according to The Guardian. Eight French citizens and three Italians were also missing, according to both governments.
Multiple people remain missing, including at least three Belgians, two Americans, two Dutch citizens, and an Indian national.
BBC News reported 51-year-old David Dixon, of England, has also been missing since the attacks. He often uses Brussels' metro system and failed to show up to work Tuesday, according to the television station.
Crowds gather to remember the victims
Belgium announced three days of mourning Tuesday to remember those affected by Tuesday's attacks. People took to the streets to pay tribute to the victims, using chalk to write messages like "Love is my religion," and "Islam -- it's not terrorism."
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