Last week, after the Brussels attacks, Mayor de Blasio rode the subways in an attempt to try and reassure New Yorkers.
Meanwhile, security was boosted in subways and other major sites.
The NYPD has its own counterterrorism unit, the biggest of any other city, and New York is inarguably one of the best prepared departments anywhere.
Joining us this week is the NYPD's top uniformed officer, Chief of Department James O'Neill.
"It can't happen here." That thought will likely never cross the minds of the good people of San Bernardino, an hour east of Los Sngeles.
It's not a big city - in fact there are 99 bigger cities in the country.
But it became the target for a married terrorist couple - hooked up with ISIS - who gunned down 14 people and hurt nearly 2 dozen others.
No city is too small.
I recently interviewed the chief of the San Bernardino police department, Jarrod Burguan, and asked how the terror attack changed his community.
Finally this week: remembering a man who embodied the spirit of public service -- an extraordinary New Yorker who worked for 5 decades, trying to make our lives better.
Nicholas Scoppetta was 83 when he died of cancer on Thursday.
He served every mayor from Lindsay to Bloomberg. He investigated corrupt cops, fixed the broken agency that takes care of kids in trouble, and led the FDNY after 9/11 - a department in crisis.
Nick Scoppetta had a rare combination of compassion and organization.
It was honor to work closely with him on this station's long-standing Operation 7 fire safety campaign.
Nick honored me with a humanitarian award from the FDNY. And I cherish it.
Just as New York City cherished Nick. We mourn his death, but we rejoice his life.