Marie Andrusiewicz

A family of four from Massachusetts and a 25-year-old woman in an SUV were killed in the chain reaction crash on Interstate 95.

NTSB board member Tom Chapman says preliminary findings suggest the driver of the bus did not respond to a lineup of stopped traffic near a work site.

U.S.

Transportation Secretary Sean Duffy said in a social media post that the bus driver, a U.S.

citizen originally from China, held a commercial license but does not speak English.

Investigators say they are looking at language proficiency, among other potential factors, but have not yet drawn conclusions.

Marie Andrusiewicz, NPR News.

The Secret Service says a little after 6 p.m.

local time, an individual took a gun from his bag and began shooting.

Officers returned fire, hitting the shooter who was transported to a local hospital where he died.

A bystander was also struck by gunfire.

The FBI and the D.C.

Police Department are assisting in the investigation.

President Trump was in the White House at the time of the shooting.

The Secret Service says the president was not impacted and no officers were injured.

On social media, Trump described the suspect as having, quote, a violent history and possible obsession with our country's most cherished structure.

Maria Andrusiewicz, NPR News, Washington.

Officials say the individual tested positive for the Andes strain of the virus, while a second passenger is experiencing mild symptoms.

All 17 Americans who are on the affected cruise ship will quarantine in Omaha at the University of Nebraska Medical Center, with the symptomatic passenger going to a separate treatment facility.

All will undergo clinical evaluation.