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Right-wing nationalists invade Brussels memorial
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Deadly Explosions Rock Brussels 16 videos
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An unidentified traveler runs through the smoke filled terminal at Brussels Airport after explosion rocked the terminal Tuesday morning.
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In this March 22, 2016 file photo provided by photographer Ketevan Kardava, Nidhi Chaphekar, a Jet Airways flight attendant from Mumbai, right, and another unidentified woman are shown after being wounded in Brussels Airport in Brussels, Belgium, after explosions rocked the airport. Chaphekar said she has recovered 70 percent of her previous fitness level and would like to resume her passion, flying. (Ketevan Kardava via AP, File)
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This handout photo released on April 7, 2016 by the Belgian federal police at the demand of the Brussels' king prosecutor shows grabs of security footage of the third suspect from the Brussels airport attack on March 22. Belgian prosecutors on April 7 launched a fresh appeal for help to find a suspected third attacker in last month's bombings at Brussels airport, releasing new video footage and pictures of the so-called "man in the hat". / AFP PHOTO / BELGIAN FEDERAL POLICE AND BELGA / Handout / RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / BELGA / BELGIAN FEDERAL POLICE " - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS HANDOUT/AFP/Getty Images
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Story highlights

NEW: U.S. State Department confirms four Americans were killed in last week's attacks

Police corral several hundred anti-immigrant protesters at a memorial site

Nine people were taken in for questioning Sunday after raids, prosecutor's office says

Brussels, Belgium CNN  — 

Protesters interrupted a memorial gathering for Brussels attack victims Sunday, raising their arms in Nazi salutes and shouting anti-immigrant slogans as they scuffled with people who’d gathered for a peaceful vigil there.

Organizers had postponed a scheduled march in Brussels out of security fears, but some mourners gathered at the Place de la Bourse in a commercial district of the Belgian capital to create a makeshift memorial Sunday. They laid flowers at the foot of the stairs leading to the Brussels Stock Exchange.