Overnight protests rock Ferguson

Authorities in Ferguson have declared a state of emergency following violent protests.

FILE: Tear gas reigns down on a woman kneeling in the street with her hands in the air after a demonstration over the killing of teenager Michael Brown by a Ferguson police officer on August 17, 2014. Picture: AFP.

NEW YORK - Tensions between residents and police have escalated into further protest after an 18-year-man was shot and wounded on Sunday.

The unarmed black teenager was killed by a white police officer in 2014.

Brown's death triggered a wave of demonstrations over the use of excessive force by police officers.

Prosecutors have charged a man with assaulting police officers during Sunday's anniversary.

Tyrone Harris, whose father says he was friends with the late Michael Brown, was critically wounded in a gun battle with police.

Police say Harris was armed and opened fire, but his father has described their account as quote, 'a bunch of lies.'

Ten charges have been filed against Harris, including five counts of armed criminal action.

Protesters have regrouped overnight, with a separate protest led by clergy and civil rights groups in a rally of more than 100 people.

Meanwhile, the city's mayor has called for locals to be watchful of those who want to cause harm to the community.