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Two teachers and 19 students were killed at Robb Elementary School in Uvalde, Texas, making it the second-deadliest school shooting in U.S. history.

After saying there were no cases, officials on May 12 announced an outbreak. But without an adequate supply of tests, some say North Korea is "flying blind." And it still doesn't have vaccines.

Alexander Litvinenko, a former Russian intelligence officer, died in London weeks after drinking tea that was later found to have been laced with the deadly radioactive compound polonium-210.

The amount of resources devoted to studying gun violence is paltry compared to its public health impact. Still, the evidence shows certain policies might help prevent mass shootings.

California school authorities say a gun and a loaded magazine were found in a second-grader’s desk after other students alerted the staff.

The pandemic got more people riding bikes, but the number of cyclists hit and killed by cars is rising at an alarming rate. "We're buying materials for ghost bikes in bulk," one cycling advocate says.

North Korea launched three ballistic missiles toward the sea on Wednesday, its neighbors said, hours after President Joe Biden wrapped up his trip to Asia.

A roundup of key developments and the latest in-depth coverage of Russia's invasion of Ukraine.

Vadim Shishimarin, 21, had pleaded guilty last week to shooting an unarmed Ukrainian man in late February. On Monday, a panel of judges in Kyiv sentenced him to life in prison.

Advocates of the proposal say it would prevent overdoses, slow the spread of HIV and inspire drug users to seek help, while proponents say safe injection sites would create an "open drug scene."