Howard Berkes

Updated at 4:50 p.m. ET

Investigators in Las Vegas are sifting through evidence they've gathered from the homes of the man who sprayed a concert crowd with gunfire. They've begun to interview his girlfriend. They've learned quite a bit about Stephen Paddock's past and preparation, but there is still no explanation for why he damaged and destroyed so many lives.

Copyright 2017 NPR. To see more, visit http://www.npr.org/.

KELLY MCEVERS, HOST:

Copyright 2017 NPR. To see more, visit http://www.npr.org/.

KELLY MCEVERS, HOST:

The second-highest ranking member of the Florida Senate pledged a legislative review of a state law that has allowed injured undocumented workers to be arrested and potentially deported rather than paid workers' compensation benefits.

"Legitimate injuries shouldn't be denied just because the person was an undocumented immigrant," said Republican Sen. Anitere Flores, the president pro tempore of the state Senate and chairwoman of the Banking and Insurance Committee.

At age 31, Nixon Arias cut a profile similar to many unauthorized immigrants in the United States. A native of Honduras, he had been in the country for more than a decade and had worked off and on for a landscaping company for nine years. The money he earned went to building a future for his family in Pensacola, Fla. His Facebook page was filled with photos of fishing and other moments with his three boys, ages 3, 7 and 8.

But in November 2013, that life began to unravel.

NPR's ongoing investigation of the advanced stage of the fatal lung disease that afflicts coal miners has identified an additional 1,000 cases in Appalachia.

That brings the NPR count of progressive massive fibrosis, the most serious stage of the disease known as black lung, to nearly 2,000 cases in the region, all of which were diagnosed since 2010.

Updated at 6:25 p.m. ET

Two Democratic members of Congress want three federal agencies to work together to get a more accurate count of coal miners suffering from progressive massive fibrosis, the worst stage of the fatal disease known as black lung.

The request is a response to an NPR investigation that shows 10 times as many cases of the advanced stage of black lung as identified and reported by the National Institute for Occupational Safety and Health.

In the second of two reports, NPR looks at the causes of a dramatic spike in progressive massive fibrosis, the most serious stage of the coal miners' disease, black lung. The spike also could stress the federal black lung benefits program, which is already struggling. (Read and listen to the first story here).

Across Appalachia, coal miners are suffering from the most serious form of the deadly mining disease black lung in numbers more than 10 times what federal regulators report, an NPR investigation has found.

The government, through the National Institute for Occupational Safety and Health, reported 99 cases of "complicated" black lung, or progressive massive fibrosis, throughout the country the last five years.

West Virginia's Democratic candidate for governor is a billionaire, a philanthropist and a resort and coal mine owner who cites his business and mining experience as major attributes as he seeks to lead his home state out of a severe budget and economic crisis.

"I am not a career politician; I am a career businessman," wrote Jim Justice in an April 5 op-ed that appeared in the Charleston Gazette-Mail.

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