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.

Several hundred men -- most dressed in black, a handful with their faces totally or partially obscured, and many carrying alcoholic beverages -- arrived on the square at about 2:45 p.m.

One demonstrator sparked a flare, and others lit firecrackers in the square. A group unfurled a white banner that said, "FCK ISIS" and "Casuals Against Terrorism." It's unclear if the groups are related, but Casuals United is a British far-right group affiliated with the English Defence League, which opposes the spread of Islam and Sharia law.

The nationalist demonstrators chanted, "We are at home," and there were minor scuffles as some people at the site trampled through the flowers, flags and balloons that composed the memorial for those killed in Tuesday's terror attacks at the Brussels Airport and a metro station.

Police use water cannons to disperse anti-immigration protesters Sunday.

Mourners countered the men's chants with their own: "No to hatred" and "We are all the sons of immigrants."

Backed by two white tactical vehicles with water cannons aimed at the crowd, riot police formed a horseshoe around the anti-immigrant demonstrators, corralling them and pushing them down a nearby boulevard, away from the memorial.

The crowd on the stock exchange's steps cheered as police briefly unleashed the water cannons on demonstrators.

With Brussels still on edge after Tuesday's bombings, authorities had requested that a peace march planned for Easter be postponed, organizer Sophie Barthelemi said.

For those who went to the Place de la Bourse memorial Sunday, the atmosphere of quiet sorrow was shattered only briefly; it took about an hour for police to clear the protesters.

That was enough time to expose a powerful divide in how people in Brussels are responding to terror.

Suspect charged

Another suspect has been charged with terrorist murder, Belgium's federal prosecutor's office said. Authorities identified the suspect as Faycal C, but they haven't specified what role the person allegedly had in the bombings at the airport and a subway station.

In addition to terrorist murder, Faycal C. faces charges of participation in terrorist activities and attempted terrorist murder, officials said.

No weapons or explosives were found in the person's home, which Belgian authorities raided Thursday, the office said. Further details about Faycal C. were not immediately available.

Police also carried out 13 raids in and around the Belgian capital on Sunday, taking nine people in for questioning, according to the federal prosecutor's office.

Five of those questioned were later released after "in-depth interviews," according to a statement. A magistrate will decide whether to keep the remaining four in custody, the office said.

Arrests have also taken place in other European countries. On Saturday, an Algerian national was taken into custody outside the southern Italian city of Salerno on suspicion of being part of a network producing fake residency documents linked to the Brussels attacks, the Italian National Police said.

The Algerian man was wanted in Belgium over his alleged involvement in clandestine immigration linked to the Paris attacks, police said via Twitter.

'Devastated infrastructure' at airport

Residents of Brussels are trying to return to some sense of normalcy in the wake of the attacks.

Photos: Terror attacks in Brussels An injured woman leaves the airport in Brussels, Belgium, after two explosions rocked the facility on Tuesday, March 22. There was also an explosion at a subway station in the city. Hide Caption 1 of 22 Photos: Terror attacks in Brussels Windows are blown out after the deadly attack at the airport. Hide Caption 2 of 22 Photos: Terror attacks in Brussels A police officer directs passengers in a smoke-filled airport terminal. Hide Caption 3 of 22 Photos: Terror attacks in Brussels Two wounded women are seen in the airport. Hide Caption 4 of 22 Photos: Terror attacks in Brussels This photo from inside the airport was shared by Jef Versele on Facebook. Hide Caption 5 of 22 Photos: Terror attacks in Brussels Subway passengers walk along the tracks following a blast at the Maelbeek metro station. Hide Caption 6 of 22 Photos: Terror attacks in Brussels A private security guard helps a wounded woman outside the Maelbeek metro station. Hide Caption 7 of 22 Photos: Terror attacks in Brussels Wounded people are treated outside the subway station. Hide Caption 8 of 22 Photos: Terror attacks in Brussels Rescue teams evacuate the subway station. Hide Caption 9 of 22 Photos: Terror attacks in Brussels Police officers guard the area around the subway station. Hide Caption 10 of 22 Photos: Terror attacks in Brussels People react as they walk away from the Brussels airport. Hide Caption 11 of 22 Photos: Terror attacks in Brussels A man with blood stains on his sweater leaves the airport. Hide Caption 12 of 22 Photos: Terror attacks in Brussels Passengers leave the airport after the attack. Hide Caption 13 of 22 Photos: Terror attacks in Brussels A young girl looks out of the window of a bus after airport evacuations. Hide Caption 14 of 22 Photos: Terror attacks in Brussels People stand near the airport after evacuations. Hide Caption 15 of 22 Photos: Terror attacks in Brussels Passengers gather outside the airport. Hide Caption 16 of 22 Photos: Terror attacks in Brussels Police officers stand guard near the Maelbeek metro station. Hide Caption 17 of 22 Photos: Terror attacks in Brussels A police helicopter flies above the area near the subway station. Hide Caption 18 of 22 Photos: Terror attacks in Brussels People embrace outside the Brussels airport. Hide Caption 19 of 22 Photos: Terror attacks in Brussels People are led away from the airport after the attacks. Hide Caption 20 of 22 Photos: Terror attacks in Brussels A victim receives first aid near the Maelbeek metro station. Hide Caption 21 of 22 Photos: Terror attacks in Brussels Ambulances arrive at the airport. Hide Caption 22 of 22

But the task is complicated by the continuing manhunt, complete with raids, gunfire, explosions and live news conferences.

And at the airport, where two bombings significantly damaged the facility, officials said they're trying to get things up and running -- but more work needs to be done. On Tuesday, hundreds of airport staffers will conduct tests of a temporary setup for security screenings, checking in and checking luggage, the airport said in a statement Sunday. But it's too soon to say when the airport will reopen.

"The simple fact," the statement said, "is that a restart in the short term is not possible in the devastated infrastructure."

More victims identified

Authorities said 24 deceased victims have been positively identified: 13 were Belgians, and 11 were foreigners from eight nationalities. More than 300 people were injured.

The death toll includes four Americans, a State Department official told CNN Sunday. Previously officials had confirmed that two Americans were among the dead.

President Barack Obama called the parents of Americans Justin and Stephanie Shults on Sunday to express his condolences, a White House official said.