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Massive explosions in Tianjin, China, have killed at least 50 people, according to Chinese state media.

Pictures shared online and by state media show a gigantic fireball and huge explosions rocking the coastal city of Tianjin in Northeast China, BuzzFeed News writes. At least 50 people have died and 71 remain in critical condition, China’s Xinhua News reported. More than 500 people have been hospitalized.

The explosions began in a warehouse belonging to Ruihai Logistics, a freight-handling business that stores goods including compressed and liquefied gases, flammable liquids and solids, and other combustible materials, according to the company’s website.

Former U.S. President Jimmy Carter has revealed that he has cancer.

The 90-year-old said the cancer was discovered by a recent liver surgery, and it has spread to other parts of his body. “I will be rearranging my schedule as necessary so I can undergo treatment by physicians at Emory Healthcare,” Carter said in a statement. “A more complete public statement will be made when facts are known, possibly next week.”

Kena Betancur / AFP / Getty Images

A bit of background.

Carter served as president from 1977 to 1981. In 2002, he was awarded the Nobel Peace Prize, and he recently published a memoir, A Full Life, on his early years in rural Georgia, his time as president, and his later work as a humanitarian, BuzzFeed News’ Claudia Koerner writes. Carter is one of four current living former U.S. presidents. The others are: George H. W. Bush, 91, George W. Bush, 69, and Bill Clinton, 68.

WE’RE KEEPING AN EYE ON

Hillary Clinton met with members of #BlackLivesMatter after they were barred from her campaign event in New Hampshire.

“In a matter of months, Black Lives Matter has become a powerful enough force in Democratic politics that campaign staffers actually accommodated would-be protesters as both worked the media,” BuzzFeed News’ Ruby Cramer and Darren Sands write. In New Hampshire, this was “Clinton’s first such encounter with the group whose name, often written as a one-word hashtag, #BlackLivesMatter, has become the powerful avatar of a broader social and racial justice movement,” Cramer and Sands write. But what do activists actually want from Clinton?

Democratic presidential candidate Hillary Clinton prepares to take questions from reporters following a town hall meeting on Monday in Exeter, New Hampshire.

Darren Mccollester / Getty Images

What's next?

Campaign stops. Rallies. Debates. The first Democratic primary debate will be held on Oct. 13 in Nevada. After that, we’ve got five more debates every month through March. On the Republican side, we’ve got another debate coming up Sept. 16 in California. And if you’ve lost track of who’s running, here’s a quick overview.

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DID YOU HEAR ABOUT THIS?

California isn’t actually in the middle of a wildfire apocalypse.

There’s no doubt that California’s fires are bad, but a review of federal data shows that this fire season isn’t particularly out of the ordinary. “Certain fi