The killing of another black man by police in US state of Wisconsin has triggered mass protest.

The police shot a black man many times while responding to what they said was a domestic incident, BBC reports.

After the incident occurred, the man, identified as Jacob Blake, is in a serious condition in hospital.

A detail of what actually happened to the blackman was recorded in a Video which was posted online.

The video appears to show Mr Blake being shot in the back as he tries to get into a car in the city of Kenosha.

The high point of the whole scene occurred as an unrest broke out after the shooting which has made authorities in Kenosha to declare an emergency overnight.

Other activities that occurred after the shooting was: the setting ablaze of vehicles by hundreds of people, who also marched on police headquarters on Sunday night.

The theme of their protest was: “We won’t back down”.