Per the Montgomery County Police Department at 2:16pm on Tuesday afternoon:
”Wheaton High School is on lockdown. Loiderman Middle School and Weller Road Elementary are sheltering in place following a report of a person with a gun near the campus. MCPD is investigating the validity of the report.”
2:37pm update: “The lockdown at Wheaton HS and shelter in place at Loiderman and Weller Road have been lifted. No gun was located.”
A 2:44pm update from MCPD stated that all schools were in a shelter-in-place, correcting their earlier report of a lockdown.