After his shift, the 35-year-old sergeant reportedly visited three other bars on the Upper East Side, leaving Brady's on Second Avenue at 2 a.m. Thursday.
"I wasn't going to serve the guy, but I didn't want to have to say no to a drunk with a gun," bartender Peter Carew told the Daily News. "Thank God nobody tried to take the gun from him and nobody got hurt."
Hynes left the bar and on the street, pulled a gun from his waistband and opened fire, hitting an ATM machine chained to a storefront, police said.
An NYPD spokesman said that the 11-year NYPD veteran, assigned to the ceremonial unit, was suspended without pay following his arrest.
He was arraigned Thursday on charges of criminal mischief, reckless endangerment and prohibited use of a weapon.
"We've entered a not guilty plea and are doing an investigation," Anthony DiFiore, a Sergeants Benevolent Association lawyer who represents Hynes, told the News.
Hynes, who was released without bail, faces up to four years behind bars if convicted.
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