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On new yorkers. >> it's really hard to love a city and have to constantly look over your back for fear of random attacks, which is nonstop. >> internally, the department grappling with challenges of its own. the nypd battling federal lawsuits, alleging gender discrimination within its ranks and thin the wake of massive protests, continuing questions about police use of force when dealing with communities of color. >> if they're going to decrease the crime rate, you know, without harming the black community as a whole, that's fine. as soon as they start targeting us, that's an. >> reporter: joi...

Has picked keechant sewell to take over the nation's largest police department. cnn's jason carroll has more on sewell and what she's up against. >> reporter: keechant sewell stepped in front of cameras and made history. >> it's with a humble heart and clear eyes about the task and the challenge ahead that i accept the position of new york city police commissioner. >> sewell will be the first woman and the third african-american to become police commissioner in the department's 176-year history. >> i am mindful of the historic nature of this announcement. i bring a different perspective, commi...

Sewell after a nationwide search, confident she is the one with the skills to transform the nypd. >> i'm so proud this day to tear down barriers. this amazing law enforcement professional, she carried with her throughout her career a sledge hammer, and she crushed every glass ceiling that was put in her way. and today, she has crashed and destroyed the final one we need in new york city. >> reporter: sewell is a native of queens, she's 49 years old, and has spent the past 25 years in the nassau county police department, she will be the leading the police force, as the city faces an increase in...