Police in the US city of Kenosha arrested a teenager on murder charges on Wednesday after two people were shot dead during anti-police protests, reported AFP.

Violent clashes erupted in Wisconsin since police shot a black man Jacob Blake seven times in his back as he tried to enter his car with his children.

Meanwhile, President Donald Trump said he was sending in additional federal forces.

On Tuesday, two people were shot dead and a third injured after a man in civilian clothes with an assault rifle opened fire on demonstrators during protests.

“This morning Kenosha County authorities issued an arrest warrant for the individual responsible for the incident, charging him with First Degree Intentional Homicide,” Antioch police said.

“The suspect in this incident, a 17-year-old Antioch resident, is currently in custody of the Lake County Judicial System pending an extradition hearing to transfer custody from Illinois to Wisconsin.”

The US President announced that additional federal forces were headed to Kenosha as police try to keep control of the volatile demonstrations.

“We will NOT stand for looting, arson, violence, and lawlessness on American streets,” Trump tweeted.

“TODAY, I will be sending federal law enforcement and the National Guard to Kenosha, WI to restore LAW and ORDER!”

The announcement came after speaking Trump spoke with Wisconsin Governor Tony Evers. Evers, earlier in the day, announced he was authorizing increased National Guard support for the county to 250 members.