Belgian police said Sunday they have detained 230 people in the northern city of Antwerp after clashes at a demonstration against an anti-Islam film that has sparked a wave of protests.

The protesters shouted anti-US slogans, and some also set fire to the US flag, according to television footage of Saturday's unauthorised demonstration in an area that has a large Muslim population.

It degenerated into clashes with police after officers blocked the protesters from moving to a main thoroughfare.

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