Four anti-NATO protesters have been arrested at a demonstration outside a Chicago immigration court, just days before a two-day NATO summit kicks off in the city.

Police made the arrests when around 100 people gathered outside the court on Tuesday to protest against US wars, economic injustice, and the country’s immigration policy. A Chicago priest from Our Lady of Guadalupe Anglican Mission and a woman were among those arrested.

A group of anti-Wall Street Occupy Chicago protesters also joined the protesters, and as the group marched downtown, the police detained two of the Occupy Chicago protesters.

On Monday, eight protesters were arrested and charged with trespassing after they refused to leave the Chicago office tower housing US President Barack Obama's 2012 campaign headquarters.

Thousands of protesters are expected to come to the city when leaders of the 28 NATO members and 22 allied countries meet on Sunday and Monday.

Chicago police have been equipped with new riot gear, including sound cannons, to deal with anti-NATO protesters. Critics say these devices can cause hearing damage.(Press TV)