5 things we know about Brooklyn subway shooting

NEW YORK -- A massive investigation is underway following a mass shooting on a Brooklyn subway train on Tuesday morning.

Here are five things we know:

1. The shooting happened at around 8:24 a.m. Tuesday on a Manhattan-bound N train in Sunset Park. Authorities say as the train was approaching the 36th Street station, a person on board threw two smoke grenades and started shooting. Police currently do not have a motive for the attack.

2. At least 23 people were treated at local hospitals, but the NYPD said there appears to be no life-threatening injuries. Of the victims, 10 -- seven males and three females -- were struck by gunfire, including five who were last reported to be in critical but stable condition. Thirteen people suffered injuries related to smoke inhalation, falling down or a panic attack.

3. At the scene, police recovered a Glock 17 9mm handgun and three extended Glock-type magazines, along with 33 discharged shell casings, 15 bullets, five bullet fragments, two detonated smoke grenades, two non-detonated smoke grenades, a hatchet, black garbage can, black rolling cart, gasoline and a U-Haul key.

4. Police arrested suspect Frank R. James, 62, of Philadelphia on Wednesday in the East Village. According to police, James rented the U-Haul van in Philadelphia. The van was later found in the Gravesend section of Brooklyn.

5. Sources say cameras inside the subway station were not operational.

In:
• Brooklyn
• Subway
• NYPD
• Mass Shooting
• Sunset Park