Police Director Samuel DeMaio says police have made more than a dozen arrests of juveniles and young adults for strong-arm robberies and assaults in Newark's downtown area since the post-concert assaults.
Earlier this week, in an apparently unrelated incident, two off-duty detention officers were shot, one fatally, outside a bar near the Prudential Center.
The Eastern Conference Finals between the New Jersey Devils and New York Rangers will take place at the arena on Saturday and Monday.
City officials insist the recent incidents are isolated.
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