Two shootings in Washington suburbs, one dead, three wounded

One person died and three were wounded in a pair of shootings today in the suburbs of Washington, and police are investigating if they are linked.
A person of interest is being sought, police said after the first shooting, outside a mall in Bethesda, Maryland.
Three people were wounded in the incident, Montgomery County police said.
Another shooting shortly thereafter, a few miles away in outside a supermarket, left one woman dead.
Students at all public schools in Montgomery County were ordered to shelter in place, police said.