COVID-19 updates: Anti-vaccine protesters halt vaccinations at Dodger Stadium

This year's Boston Marathon will be held on Oct. 11, if road races are allowed in Massachusetts' reopening plan at that time, according to the Boston Athletic Association.

A virtual race will also be offered as an option to runners.

"While it was of course the right thing to do, canceling the 2020 Boston Marathon for the first time in its 124-year history was one of the hardest announcements to make," Boston Mayor Marty Walsh said in a statement Tuesday.

"Today, I'm filled with hope, as we set our sights on October for the running of the 125th Boston Marathon," he added. "We have a ways to go before we're out of the woods, but guided by sound judgment and the advice of our public health experts, I am hopeful that we'll get to enjoy the return of one of Boston's most storied traditions this fall."

ABC News' Leo Mayorga contributed to this report.

Several hundred White House staffers have already been vaccinated against COVID-19 by the White House medical team, White House officials said, confirming a report from Axios.

The White House hopes to vaccinate all in-person staff in the next few weeks, officials said.

ABC News’ Molly Nagle contributed to this report

The United States is seeing improvements in COVID-19 infections and hospitalizations. In the last two weeks, the country's seven-day average of new COVID-19 cases has declined by 33.1%, according to ABC News' analysis of data compiled by The COVID Tracking Project, a volunteer-run effort to track the U.S. outbreak.

On Monday, Missouri reported the fewest number of new cases since September, while South Dakota reported the lowest number of new cases since July.

COVID-19 hospitalizations are also declining nationwide. The COVID Tracking Project said the number of people hospitalized with the disease in the U.S. is currently at its lowest since Dec. 14.

Hospitalizations are even trending down in California, which has more COVID-19 patients in hospitals than any other U.S. state.

ABC News’ Arielle Mitropoulous contributed to this report.

Colombian President Ivan Duque announced Tuesday that Defense Minister Carlos Holmes Trujilo died in the early morning hours from COVID-19 complications. He was 69.

"I can't express the pain that I have," Duque said in a statement while conveying his condolences to Trujilo's family.

Colombia has the third-highest number of confirmed COVID-19 cases in the Americas, behind the United States and Brazil, according to the World Health Organization.

ABC News’ Christine Theodorou contributed to this report.