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.
(..) Alpha -er, this is Condor. Come in, over. Captain Marks, Condor, not receiving transmission. Captain Marks, all escorters are ordered to cease all activity. No-no-no... Dr. Banks you can't go in there. - We just need to ask one question. - Dr. Banks! The session is finished. (..)2016 Arrival