tim fletcher is live in time's square. tim. >> reporter: security here in time's square and other locations has increased. the nypd is telling visitors and residents that the city is safe. this video still has some nervous. >> those visible signs, the extra officers on patrol, others who are specially trained, they believe may ease concerns but an isis rereleased propaganda video shows time's square could be creating concerns for others. >> your worse nightmare with narrowing terrorism with cyber space is effective. >> dr. jeffery libberman also seeing the timing of the video right after the vicious attacks in paris couldn't be worse. >> pointing to time's square during the holidays, thanksgiving and christmas, you couldn't get something that was more effective than that. >> the nypd has ramped up security measures including the new critical response command. over 500 officers highly trained and heavily arms will go directly at terrorists offensively. commissioner bill bratton has seen the video. >> there's nothing specific

tim fletcher is live in harlem with the details. >> this gun violence initiative focuses on a number of fronts. everything from marches on the streets to pop culture which is so popular with young viewers. the mother of four-year-old logan morgan who was killed by a stray bullet four years ago. >> kids are being murdered in these streets. we got to do better. >> comes a new effort pushed but lawmakers, civic activists, and to raise greater awareness of gun violence and cold confront its deadly nature on many fronts. >> it's time for the country to focus all our energy, ability, and all our attention on dealing with the gun violence epidemic that we have to confront. >> federal lawmakers will push for a national gun awareness month. there's concern about the flood of guns in cities of all sizes. problem. we'll all be responsible for our part of the solution. >> but pop culture some here point out, including spike lee's films can carry a strong message to young viewers. he's chosen chicago. racked by the death of laquan mcdonald, shot 16 times by a chicago police officer. and the vicio

"america tonight's" lisa fletcher now, with an in depth look. >> all right, so this is tim's room. >> reporter: the undeniable love of a mother for her child is evident in a person's home. his room is untouched. >> i can't tell you how many times i've broke down, can't tell you how many times and i will continue to do that. you know i have conversations with him in this room. i can't talk about this anymore . >> katherineham let sat down with "america tonight" just five months after she learned her only child had passed away. with no answers to why he made the unthinkable choice. >> so when you were firtime for -- aljazeera.com notified of his disappearance,-m what was going through your head? >> immediately, i was looking for him, and we filed a police report right away. it never crossed my mind that my child would die by suicide. and it never dawned on me that he would jump off a bridge. so much so, that whield we were while we were searching in the washington heights area, i remember saying to someone, well at least we know something, we know he didn't jump. the irony of that state