5:17 p.m. ET: Authorities in Arizona have discovered a lighted, ventilated cross-border drug smuggling tunnel more than two football fields long and possibly linked to the Sinaloa drug cartel just steps from an official border-crossing checkpoint between Mexico and the U.S.

Read the full story HERE

3:01 p.m. ET: Deadly dentists?

Credit: Raven Maria Blanco Foundation

American children are being put at risk by inadequately trained dentists who often seek to enhance profits by sedating their young patients for even routine tooth cleaning and cavity treatments, an ABC News investigation has found.

Get a preview of the Brian Ross investigative team's report HERE

. Tune into "Nightline" tonight at 11:35 p.m. ET to get the full story.

1:56 p.m. ET: Lawmakers were outraged Thursday after an ABC World News report revealed that the U.S. Olympic team's opening ceremony outfits are made in China. Some suggested making a bonfire with the outfits, which include berets and blazers.

"I think they should take all the uniforms, put them in a big pile and burn them and start all over again," Senate Majority Leader Harry Reid, D-Nev., said when asked by ABC News today, "If they have to wear nothing but a symbol that says USA on it, painted by hand, that is what they should wear."

So we took a look back at some of the best and worst Olympic national outfits, like these from the Hungary team at the 2008 Olympics:

Credit: William West/AFP/Getty Images

See more HERE

10:22 a.m. ET: A scathing assessment

of how head coach Joe Paterno and other top officials "concealed" the child sex abuse allegations against Jerry Sandusky for more than a decade is detailed for the first time today in the findings of Penn State's internal investigation.

"What's shocking is that the four of them, the most powerful people at Penn State University, made the decision to conceal this," former FBI chief Louis Freeh, who led the probe, said at a press conference following the release today.

Watch the video of the press conference HERE: