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Aaron Alexis had a security card that allowed him access to the Washington Navy Yard, and shot his way into an office building there by killing a police officer at the base and grabbing his handgun, military officials said Tuesday.

The minimum wage has recently been in the news because of the fast-food workers’ strike for $15 an hour. Critics claim that would cause unemployment. There is a tipping point, but we don't really know where that is. The principal reason minimum wage increases have not led to disemployment effects is that the minimum has been so far below a market clearing wage. In the case of the fast-food industry increases, so long as they are below the tipping point, they are likely to lead to increases in employment because the fast-food industry is a labor monopsony. That is, they are the principal employers of minimum wage workers.

One of the most deceptive ideas continuously sounded by the Right (and its fathomless think tanks and media outlets) is that the "free market" is natural and inevitable, existing outside and beyond government. So whatever inequality or insecurity it generates is beyond our control. And whatever ways we might seek to reduce inequality or insecurity—to make the economy work for us—are unwarranted constraints on the market's freedom and will inevitably go wrong.

Among the dozen people gunned down at the Washington Navy Yard shooting on Monday were mothers, husbands, wives, and children whose families waited anxiously to hear whether their relatives were among those killed on Monday in the deadliest mass shooting since Sandy Hook Elementary School.

Here are some of the top stories we're following at NBC News on Tuesday:Gunman's death leaves many questions unanswered: Authorities scoured Aaron Alexis’ hotel room and his background, seeking clues into his motive for his attack on the Washington, D.C., Navy Yard on Monday.

Almost half of the people who were declared unaccounted for or missing following devastating floods in Colorado have been found safe following an intensive search by rescue teams, officials said.About 1,200 people were hadn't been heard from early Monday, five days after the floods hit.

FBI and ATF agents searched a hotel room late Monday where Washington Navy Yard gunman Aaron Alexis had been staying, hours after the former petty officer killed 12 people in a rampage.

Many questions about Monday's shooting deaths of 13 people at the Washington Navy Yard remain unanswered and with the main suspect among the dead, some of the specifics may never be nailed down.