The suspect, 28-year-old Luca Traini, had an Italian flag draped over his shoulders when he was arrested.
A photograph of Traini in police custody shows he has a tattoo associated with neo-Nazis on his forehead.
Italian authorities have identified the suspected gunman who shot six African foreigners in the Italian city of Macerata.
The far-right League party, under whose banner Traini previously unsuccessfully stood for local elections, has pledged to carry out mass deportations of 150,000 migrants within a year if elected.
Policemen have identified the defendant as Luca Traini, a 28-year-old Italian boy with no previous background.
One of the six victims was treated and released Saturday.
He said: "Let's stop this risk, let's stop it now, let's stop it together", in a nationally televised statement from his residence, the Palazzo Chigi, in Rome.
Italian police also tweeted a photo of the moment of capture, saying one of the wounded had required surgery.
Italian Premier Paolo Gentiloni said Italy would be "particularly severe against whoever thinks of nourishing this spiral of violence".
The League backs fiercely anti-immigrant policies and is part of ex-prime Silvio Berlusconi's centre-right alliance that is leading in the polls ahead of a March 4 national election.
Roberti said "it's likely that he carried out this insane gesture as a sort of retaliation, a sort of vendetta" after a Nigerian man was arrested in the gruesome slaying of an Italian teenager a few days previously in the same city. "The closeness of the two events makes you imagine there could be a connection".
Officials in a central Italian city have confirmed that a suspect in drive-by shootings against foreigners has been apprehended.
Macerata, Italy is the scene of a mass shooting targeting black people. Macerata was the scene of a gruesome killing earlier this week of a white Italian woman. Policemen after this incident have warned the people to stay inside while the shootings were ongoing.
The teen's dismembered remains were found Wednesday in two suitcases two days after she walked away from a drug rehab community.
Authorities have paused public transport and said students must be kept inside schools, which are open on Saturdays. The chief suspect is a Nigerian immigrant. People injured. Police operation under way.
The black auto Alfa Romeo of young man suspected of wounding several foreign nationals in a drive-by shooting, is blocked by police and Carabibieri enforcement at Macerata, on February 3, 2018. Macerata's mayor has urged citizens to stay indoors Saturday while the suspects remain at-large. His victims were two young African migrants.
The website of newspaper Corriere della Sera said a man fired from a vehicle window at two young African migrants shortly after 11 a.m. (1000 GMT) Saturday, wounding one of them.
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