a 'masked' ball [=a formal party for dancing at which people wear masks]
She 'masked' [='hid'] her anger with a smile.
The bank was held up by 'masked' robbers.
(..) is speculation... ...at this point. However, several eyewitnesses... ...to the crime, as well as our own preliminary findings, have... ...for the masked vigilante known as Spider-Man. And lastly, city council members met with homeowners and airport officials... It's so beautiful. (..)2012 The Amazing Spider-Man