It didn't. Someone posted about snipers spotted near a protest, which is common at any large crowds in big cities (like the Macy's Thanksgiving Day Parade). It's just a bad meme.
Also, one is an elite federal police officer that passed extremely stringent background checks, has an extraordinary employment history, has completed the world's best body guard training. The other made it thru a 5-month certification process at the local community college.
Just because they're both agencies that enforce laws, doesn't make them both police. You don't call the Secret Service when your neighbors dog shits on your lawn. Or when someone breaks into your car... Unless you're literally the president/ex-president.