I'm going to say that both bombers look vaguely middle eastern, the guy in the white cap more so.
I also have to say that I'm disappointed in American law enforcement again. If you have an entire bloody armada of FBI, Homeland Security and Police officers, why does the guy in the shades have to get shot so many times the medical staff can't actually count the number of gunshot wounds that have peppered his body? There are countless non-lethal methods that could have taken that guy down and put him on trial.
It's just like when some of the best special forces operatives in the world were sent to kill Bin Laden, simply because it was more convenient for the US government than to capture him.
A big rule of guns is that you never shoot to wound. You
always shoot to kill. Especially in cases of crowded areas (that police often have to deal with), you can very easily miss and hit a bystander. You don't try to shoot someone in the leg, arm, or anywhere but the center of mass. People can shrug off basically everything with enough adrenaline (and/or drugs). You don't shoot for anything but the best guarantee when it's the difference between life and death. Shooting accurately is difficult enough outside of a life and death situation. If you shoot to wound, and miss, then they're going to shoot you or another person.
Basically the question is this: whose life would you rather save? The suspect's, or your own? Because anything less than shooting to kill can easily get yourself killed instead.
Anyway, there are two suspects. One was wearing a black hat, and is now dead. One was wearing a white hat, and is currently on the run. Two police officers have been shot, one is dead and the other is in surgery.
... It's incredible that only two officers have been shot during all of this. This could have turned out much worse.
I would suggest stun grenades, tear gas and rubber bullets. I know the first two would be ineffective in a very open environment (tear gas may be dangerous out in the open like that as well) but they would do the job, provided they wouldn't ignite the explosives of course.
Adrenaline can enable people to basically ignore REAL bullets, so how effective would rubber ones be?
Also, mixing explosives is a VERY VERY BAD idea. And yes, open areas make them basically useless and even more dangerous.