We we'll turn to the latest in Ferguson. The curfew lifted overnight but protest and violence not ending. President Obama has dispatched attorney general Eric holder who will be there tomorrow and... See More
We we'll turn to the latest in Ferguson. The curfew lifted overnight but protest and violence not ending. President Obama has dispatched attorney general Eric holder who will be there tomorrow and this morning we're hearing from a friend of the officer who shot Michael brown. ABC's Steve osunsami is on the scene right now. Good morning, Steve. Reporter: Good morning, George. The start of school here has been delayed yet another week. At night the police here have a new tactic with demonstrators forcing them to keep moving. No standing still. 31 people were arrested last night alone and police say many of them were from out of state. Overnight the sound of smoke bombs and the smell of tear gas filled the night over Ferguson. Police set off ear-piercing sirens against the crowds after they say rocks and bottles came flying. In the dark of night, at least two people shot, not a single bullet fired by officers despite coming under heavy attack. Reporter: The curfew lifted but police in riot gear in full effect arresting 31 people including some demonstrators who wouldn't keep moving. The state's governor sent in the Missouri National Guard. Troops with guns on the roofs of grocery stores, their armored vehicles guarding the police staging area. Hands up. Hands up. Don't shoot. Reporter: Overnight protests broke out in New York City and Atlanta too. All calling for justice more than a week after the shooting of Michael brown. And this morning, a first, we're now hearing from a good friend of Ferguson city police officer Darren Wilson who shot and killed the unarmed teen. I have exchanged text messages with him just as of a few days ago. I can tell that he's struggling, you know, I can tell that this is really hard on him. Reporter: The friend is so concerned for his own safety he asked us to conceal his face for this interview. He wouldn't speak about the shooting but says he and Wilson played hockey for years and he never saw his friend fight. He's a really quiet guy. He is just really well mannered. He is very respectful. Reporter: Prosecutors say they could present their case to a grand jury as early as this week to determine if they wait there will be charges. Dan Abrams, this grand jury, when it meets, is going to get two very different stories they have to sort through. That's right. Less than half of the cases in the county ever go to a grand jury. You don't have to take it to a grand jury but this allows the prosecutor with these sort of warring narratives to say, I didn't make the decision. They did. The grand jurors did, the people. But how vigorously the prosecutor presents this case is everything. There's no defense attorney there. It's just the prosecutor presenting a case to the grand jurors. If the D.A. Wants an indictment he'll get an indictment. If the D.A. Doesn't want an indictment or has questions, that could be a very different thing. One key piece of evidence already out there is this autopsy. How critical is it. Absolutely crucial. The autopsy and ballistics to me are essential in this case. Why? Because if the weapon was fired from a distance, if these six shots were taken from far away and all of the bullets hit him in the front, that's going to be a very tough spot for the police officer to be in. If, however, this was fired at close range, the police officer's going to say there was a struggle. We were fighting for the gun and so that becomes an absolutely essential question and, again, that's why it's so important how the D.A. Presents this case to the grand jury. At the same time you've got the attorney general saying he'll pursue a civil rights investigation on a parallel but separate track. I don't think this will turn into anything. This did a state case. Every time there is a controversial case the federal authorities come in and say we're looking at it, we're investigating, we're on top of it and I believe that all to be the case. But the reality is, this is a state case. That's where this case is going to be focused and I think the feds are just watching very, very carefully. The state will go first. Absolutely. I don't think -- again, I don't think the feds will -- where the actions will be in the case. Still so many questions.
This transcript has been automatically generated and may not be 100% accurate.