Michael Brown shooting: Police will co-operate fully
Police in the US state of Missouri have said they will co-operate fully with investigations into the shooting of an unarmed black teenager that sparked days of outraged protests.
Michael Brown, 18, was shot by a police on Saturday in the suburb of Ferguson.
Eyewitnesses have said Mr Brown, who had just graduated from high school, put up his arms and tried to surrender before being killed.
President Barack Obama and civil rights activists have appealed for calm.
According to details released by the St Louis County Police Department, Mr Brown was shot after an officer on a routine patrol asked him and another teenager to get out of the street on Saturday afternoon.
There was a scuffle and at some point the officer fired his weapon inside the patrol car, said the police.
On Wednesday, Police Chief Thomas Jackson said the officer required treatment in hospital for a facial injury.
In a statement, the Ferguson police department said it would help investigations into the incident being conducted by the county police department, the justice department and the FBI.
The department also asked protesters to demonstrate only in the daylight hours "in an organised and respectful manner", and to disperse "well before the evening hours to ensure the safety of the participants and the safety of our community".At the scene - Aleem Maqbool, BBC News, Ferguson
Among young and old, there is a sense of loss and injustice felt across the suburb of Ferguson.
People have decided now is the time to unite and show their disgust at the shooting, whether through church vigils or the poignant protests of young people raising their hands and walking towards police lines chanting "don't shoot".
The killing of Michael Brown has exposed deep-rooted racial issues here, between a predominantly African-American community and the largely white administration.
In spite of making up an estimated 67% of the population, black people are overwhelmingly under-represented in both local government and in the police force in Ferguson, which is being accused by many of inherent racism.
People have been demanding an investigation, but with the national spotlight on this community, they are also seizing the moment to demand more equality in the society in which they live.
The department's appeal comes after three nights of tense, often violent protests that have resulted in dozens of arrests, looting and the burning of a shop.
On Tuesday night, police fired tear gas into a small group of protesters who had confronted a line of officers, St Louis County Police Department spokesman Brian Schellman told the Reuters news agency.
Earlier, a far larger crowd had chanted "hands up, don't shoot" and "no justice, no peace" during a tense but non-violent stand-off with police near the site of Mr Brown's killing.
And in the early hours of Wednesday morning, police reported they shot and wounded a man near the site of protests in an apparently unrelated incident.
Officers said they responded to reports of four men wearing ski masks and holding shotguns. One man drew a handgun and fired and was shot by an officer, they said.
Civil rights activists and Mr Brown's family and friends have called for an end to violent clashes with the police, while also demanding the Ferguson police department release the name of the officer who shot and killed Mr Brown.
"To become violent in Michael Brown's name is to betray the gentle giant he was," the Reverend Al Sharpton said at a news conference on Tuesday.
President Barack Obama has promised a full investigation by the US Department of Justice into the teenager's death, and the FBI has launched its own inquiry.
"I know the events of the past few days have prompted strong passions, but... I urge everyone in Ferguson, Missouri, and across the country, to remember this young man through reflection and understanding," Mr Obama said in a statement.