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Law enforcement authorities say a motive in Sunday's mass shooting in Las Vegas is unclear. Authorities are searching the suspect's home in Mesquite, Nev., for clues.

Also: Puerto Rico struggles to secure clean water and food; the ex-CEO of Equifax apologizes for the massive security breach; and officials in Catalonia say an independence referendum is approved.

By the time it was done, Sunday night's attack had become the deadliest shooting in modern U.S. history. But when it began, all concertgoers knew was something felt very, very wrong.

Facebook turned over thousands of ads it said ran from 2015 to 2017 and vowed to change its policies to make its service tougher to use again for such interference.

NPR's Robert Siegel speaks with Las Vegas Mayor Carolyn Goodman about the mass shooting on the Strip that killed at least 58 people and injured some 515 people.

Sunrise Hospital was one of the main hospitals that received victims of Sunday's shooting in Las Vegas. Dr. Jeffrey Murawsky, the hospital's chief medical officer, talks to NPR's Kelly McEvers.

The Supreme Court is back to its full complement of nine justices and will consider issues of religion and discrimination, technology and political fairness, and the rights of unionized workers.

For years, three physicists worked to prove Albert Einstein's idea that gravitational waves are rippling through space-time. In 2015, they made history as part of the LIGO Collaboration.

Also: Rock musician Tom Petty has died; the Supreme Court takes up a gerrymandering case; and baseball's Hall of Fame is getting a bobblehead museum collection.

Mindi Abair is a superb Contemporary Jazz saxophonist and vocalist, with the Grammy nominations and touring chops to back it up. She's a friend of Jazz…