On a weekend radio show, Commissioner Bill Bratton discussed "false memory" of witnesses.
Victor Urena, 20, was the first of five people attacked by suspect David Baril, police said.
Gregory Walters hit a man in the head with a hammer at the Clock Tower Edition Hotel site, police said.
A man was buying a MetroCard when a thief hit him with a hammer and demanded his money, police said.
Alleged City Hall Park hammer attacker John Yoos may have given authorities a fake identity.
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