Four spent smoke grenades were recovered from a Brooklyn airfield Wednesday after an 80-year-old witness who saw a white U-Han — and smoke emanating from the area — a day earlier alerted authorities after seeing news coverage about their investigation into the subway station shooting, two senior NYPD officials said Thursday.
The details emerge as investigators look into whether the accused subway shooter did a possible test run at Floyd Bennett Field on Flatbush Avenue, near Jamaica Bay, before carrying out the multifaceted rush-hour attack in Sunset Park on Tuesday.
According to the senior NYPD officials, the witness spotted the van and smoke coming from behind a hangar around
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