Huo Jingnan

One person was killed and another man is in police custody after a fatal shooting in Denver on Saturday that occurred toward the end of dueling rallies by activists on the far right and the far left.

The Denver Police Department said it had taken a private security guard into custody in connection with the shooting. On Sunday, the department identified the suspect as 30-year-old Matthew Dolloff. He has not been formally charged.

After an amphibious assault vehicle (AAV) sank with 16 crew members inside during training on Thursday off the Southern California coast, the Marine Corps announced Sunday that the eight missing service members are now presumed dead.

Eight Marines on board were rescued. One of those died soon after being hospitalized and two are in critical condition.

The eight now presumed dead are seven Marines and one Navy sailor.

Tropical Storm Isaias is continuing its push toward Florida's east coast on Sunday after battering the Bahamas with heavy rainfall and gusty winds.

Isaias, which was downgraded to a tropical storm after reaching hurricane status, is whipping up sustained winds of 65 miles per hour and could bring 1 to 7 inches of rainfall from Florida to New England in the coming week, according to the National Hurricane Center.

More widespread wearing of face masks could prevent tens of thousands of deaths by COVID-19, epidemiologists and mathematicians project.

A model from the University of Washington's Institute for Health Metrics and Evaluation shows that near-universal wearing of cloth or homemade masks could prevent between 17,742 and 28,030 deaths across the US before Oct. 1.

Of the world's 20 poorest states, the Democratic Republic of the Congo spends the least per citizen on health care — $19 per person annually.

And in Sierra Leone, the highest health spender among those states south of the Sahara, it's over triple — $66 per capita.

That's still just a fraction of how much the world's wealthiest countries spend on each of their residents' health. In the United States, the number is nearly $10,000. Half of the 20 richest countries spend at least $5,000 per person.

Don't see the graphic above? Click here.

With traffic dramatically down in recent months, the United States is in the middle of an accidental experiment showing what happens to air pollution when millions of people stop driving.

A bipartisan group of lawmakers is demanding answers from the Treasury Department and the IRS about improper coronavirus relief checks paid out to deceased taxpayers.

Updated at 10:10 p.m. ET

One month ago today, President Trump declared a national emergency.

In a Rose Garden address, flanked by leaders from giant retailers and medical testing companies, he promised a mobilization of public and private resources to attack the coronavirus.

"We've been working very hard on this. We've made tremendous progress," Trump said. "When you compare what we've done to other areas of the world, it's pretty incredible."

But few of the promises made that day have come to pass.

On Feb. 29, the U.S. surgeon general Dr. Jerome Adams tweeted that masks do not offer any benefit to the average citizen.

Updated March 31, 8:25 p.m. ET

A few months ago, it may have seemed silly to wear a face mask during a trip to the grocery store. And in fact, the mainline public health message in the U.S. from the Centers for Disease Control and Prevention has been that most people don't need to wear masks.

But as cases of the coronavirus have skyrocketed, there's new thinking about the benefits that masks could offer in slowing the spread. The CDC says it is now reviewing its policy and may be considering a recommendation to encourage broader use.

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