On December 20, 2014, Ismaaiyl Abdullah Brinsley shot and killed Rafael Ramos and Wenjian Liu — two on-duty New York City Police Department (NYPD) officers — in the Bedford–Stuyvesant neighborhood of Brooklyn. Brinsley then fled into the New York City Subway, where he killed himself. Earlier in the day, before he killed Ramos and Liu, Brinsley had shot and wounded his ex-girlfriend Shaneka Thompson in Baltimore after initially pointing the gun at his own head.

On July 17, 2014, Eric Garner, a 43-year-old African American man, was killed in the New York City borough of Staten Island by Daniel Pantaleo, a New York City Police Department (NYPD) officer, after the latter put him in a prohibited chokehold while arresting him. Video footage of the incident generated widespread national attention and raised questions about the use of force by law enforcement.