An unidentified gunman shot and killed the Russian ambassador in a Turkish art gallery, authorities said. Read the latest: http://reut.rs/2i82U3e

This is Lapland, an arctic region where Santa has become a major attraction. Visitors who brave the frigid weather can catch a glimpse of him in his reindeer-drawn sleigh. Some even get to meet the man himself. Take a sleigh ride with Santa in this Facebook 360 and see more virtual reality video here: http://reut.rs/2hSlFIL

After decades of U.S. efforts against lead poisoning, 40 percent of childhood lead tests still high in some areas. A Reuters special report investigates why the situation remains dire in some American neighborhoods: http://reut.rs/2h3cJlb

Philippine President Rodrigo Duterte's office, responding to a Reuters report, came to China's defense on Monday, saying it was unfair to hold Beijing responsible for the drug problem in the Philippines.

The Russian ambassador to Ankara was shot in the back and killed by an off-duty police officer, according to Turkish security sources. Read more: http://reut.rs/2hMyDYN

As the electoral college casts its vote, we discuss the process to formally confirm Republican Donald Trump as the next president. Send us your questions in this #FacebookLive.

President-elect Donald Trump plans to nominate U.S. Army veteran and high-frequency trading expert Vincent Viola as secretary of the Army, the Trump transition team said on Monday.

Watch live as the electoral college casts its vote for president. We are #FacebookLive.

BREAKING: The Russian ambassador to Turkey has died of his wounds after being shot in an attack in an Ankara art gallery, according to Russian RIA news agency. http://reut.rs/2i1woUi

Over 40 people have died after consuming a bath oil in search for an alcoholic high in the Russian Siberian city of Irkutsk. Read more: http://reut.rs/2hRzd74

Turkey's Anadolu state-run news agency says gunman in Ankara 'neutralized': http://reut.rs/2hAp8xI

DEVELOPING: The Russian ambassador to Turkey has been seriously wounded in a gun attack in Ankara and taken to hospital, NTV and other broadcasters reported. http://reut.rs/2hMbvty

It's highly unlikely the vote will change the result of the election, but allegations of Russian hacking to influence the outcome have prompted Democrats to urge some electors not to vote as directed by their state's popular ballot: http://reut.rs/2h2xFsO

Think Flint was bad? Reuters found nearly 3,000 spots in the U.S. whose documented lead poisoning rates are at least twice as high. Find out where in our special report: http://reut.rs/2hMqm9x