Family of black teenager shot by police sue US city

The family of Michael Brown, the unarmed black teenager shot dead by US police last summer, have filed a wrongful death civil lawsuit against the city of Ferguson, Missouri.

Brown was fatally shot by former Ferguson police officer Darren Wilson in August.

In November, a grand jury elected not to file charges against Wilson. A federal investigation later determined that Wilson should not be charged.

The shooting last August sparked a wave of angry demonstrations and unrest over police violence, particularly against minorities in Ferguson and around the US.