Emergency Services Workers
If police and emergency services workers are in the area they may give advice and directions, doorknock or leave information and written instructions in mailboxes.
Remember that these workers won't always be available to help.
Building managers and fire wardens can also give advice if evacuation is necessary.
Your clients may be told to shelter in place. If so, they should stay inside, stay away from windows and wait for instructions from the emergency services, police or radio.