![Zack Bornstein on Twitter: "NYC friends, I noticed all the undercover cops are wearing white arm bands, probably to recognize each other. Be careful. https://t.co/DjRYBemW3b" / Twitter Zack Bornstein on Twitter: "NYC friends, I noticed all the undercover cops are wearing white arm bands, probably to recognize each other. Be careful. https://t.co/DjRYBemW3b" / Twitter](https://pbs.twimg.com/media/EZOuUwXUwAAGyEn.jpg)
Zack Bornstein on Twitter: "NYC friends, I noticed all the undercover cops are wearing white arm bands, probably to recognize each other. Be careful. https://t.co/DjRYBemW3b" / Twitter
![A French plainclothes Police officer holds his police armband during an unauthorized protest against anti-police violence at the old harbour in Marseille, France, October 26, 2016. T REUTERS/Jean-Paul Pelissier Stock Photo - A French plainclothes Police officer holds his police armband during an unauthorized protest against anti-police violence at the old harbour in Marseille, France, October 26, 2016. T REUTERS/Jean-Paul Pelissier Stock Photo -](https://c8.alamy.com/comp/2CN8YPR/a-french-plainclothes-police-officer-holds-his-police-armband-during-an-unauthorized-protest-against-anti-police-violence-at-the-old-harbour-in-marseille-france-october-26-2016-t-reutersjean-paul-pelissier-2CN8YPR.jpg)
A French plainclothes Police officer holds his police armband during an unauthorized protest against anti-police violence at the old harbour in Marseille, France, October 26, 2016. T REUTERS/Jean-Paul Pelissier Stock Photo -
![A French plainclothes Police officer with a police armband demonstrates during an unauthorized protest against anti-police violence at the old harbour in Marseille, France, October 26, 2016. REUTERS/Jean-Paul Pelissier Stock Photo - A French plainclothes Police officer with a police armband demonstrates during an unauthorized protest against anti-police violence at the old harbour in Marseille, France, October 26, 2016. REUTERS/Jean-Paul Pelissier Stock Photo -](https://c8.alamy.com/comp/2CM9FW1/a-french-plainclothes-police-officer-with-a-police-armband-demonstrates-during-an-unauthorized-protest-against-anti-police-violence-at-the-old-harbour-in-marseille-france-october-26-2016-reutersjean-paul-pelissier-2CM9FW1.jpg)