The university also identified clusters of positive cases in several dorms, including Ellicott and Centreville halls.
Facilities Management staff is assessing the situation, and crews are working to restore normal operations.
Jennifer Rice, the new provost, will begin her job more than a month early on July 1.
Five of the vehicles were parked in lot 12A, with the other five cars parked in the lot of the Cypress Building.
The Greenbelt, Prince George’s Plaza and West Hyattsville stations will also be closed through Sept. 6.
Fully vaccinated people will not need to wear a mask in most places, while unvaccinated people must wear masks in all public indoor places.
Rice will begin the role on August 11.
Hogan also lifted restrictions on outdoor dining beginning Saturday.
The university will invest $40 million to recruit faculty from underrepresented groups.
More than two-thirds of faculty and staff on campus reported being at least partially vaccinated.