Concern about potential internal threats has intensified as investigators have identified a growing list of individuals with law enforcement and military ties.
Just two days before his inauguration, Biden packed food at Philadelphia hunger relief organization Philabundance as part of the Martin Luther King Jr. Day national day of service.
Chester County is seeking more than $11 million in refunds from a local company that it says failed to provide one million COVID-19 antibody tests last year.
As Americans observed a national holiday Monday, New York Gov. Andrew Cuomo pleaded with federal authorities to curtail travel from countries where new variants are spreading.