Italy opposition calls for minister to go after Expo riots

Italian anti-riot policemen run in front of a burning car during a rally against Expo 2015 in Milan, Italy, May 1, 2015. Italy opens the Milan Expo on Friday, torn between hopes that the showcase of global culture and technology will cheer up a gloomy national mood and fears that it will be overshadowed by scandal, delays and street protests. [Photo/Agencies]

Northern League leader Matteo Salvini called a protest against the government's handling of the riot, which he called a "global embarrassment", for Monday in front of Milan's La Scala opera house.

Officials said they would maintain the reinforced security measures introduced before the riot, which included almost 4,000 extra police assigned to protect Expo 2015.