USCIS announced on March 18th that they have suspended routine in-person services, they have now extended that public closure until at least April 7th. This step is being taken to slow the spread of the Coronavirus (COVID-19)! USCIS will continue to operate but without public personal contact. USCIS will provide very limited emergency services that require personal contact; you must contact the USCIS Contact Center for more information.
Please visit this page for more information: USCIS Temporary Office Closure Extended until at least April 7
Source of Information:
USCIS (USCIS.gov), 3/25/20, News Alert:
USCIS Temporary Office Closure Extended until at least April 7
USCIS (USCIS.gov), 3/17/20, News Alert:
USCIS Temporarily Closing Offices to the Public March 18-April 1