NYPD members homes are now being scouted by members of the gang MS13. What should be done?

NYPD officers were briefed this week that MS13 gang members have been seen scouting out their homes in order to target them.

https://www.usatoday.com/videos/news/nation/2019/02/28/ms-13-gang-members-looking-target-nypd-officers-off-duty/39128877/