Ferguson, Missouri (CNN)

A day of peaceful vigils to mark the one-year anniversary of Michael Brown's shooting death turned ugly late Sunday when protesters threw rocks and bottles at officers, and police critically injured a man who they say fired at them.

The unidentified man in his 20s was undergoing surgery early Monday.

He unleashed a “remarkable amount of gunfire” against the officers using a stolen handgun, St. Louis County Police Chief Jon Belmar said.

“We cannot continue, we cannot talk about the good things that we have been talking about, if we are prevented from moving forward with this kind of violence,” he said.

Video here—>http://www.dailymail.co.uk/news/article-3191882/Looting-breaks-Ferguson-day-protest-mark-one-year-anniversary-Michael-Brown-s-death.html#v-4410747120001