The police are now monitoring criminal/gang/drug 'activity' in the area.
There has been an increase in the city's (level of) economic 'activity'.
The instruments are used to detect volcanic 'activity' on the island.
(..) He is most eager to join us. classified penetentiary known simply as 'The Vault' by an unknown team of men. It's yet another example of increased criminal activity since the disappearance of Spider-Man months months ago. The webslingers absence has left a hole in the heart of the city. (..)2014 The Amazing Spider-Man 2