Integration minister Cecile Kyenge, who was born in Democratic Republic of Congo, has angered far-right groups with her campaign to make it easier for immigrants to gain Italian citizenship.
Shortly before the incident on Friday, members of the right-wing Forza Nuova group left mannequins covered in fake blood at the site of the rally in Cervia, central Italy, in protest against Kyenge's proposal to make anyone born on Italian soil a citizen.
"Immigration kills," was written on leaflets accompanying the dummies - a slogan Forza Nuova has previously used when referring to murders committed by immigrants in Italy.
