BROOKLYN - Police say they're hunting for three suspects in a beating that happened on an L subway train last week. Investigators say it happened just after 2 a.m. at the Myrtle-Wyckoff subway station and the attack was captured on cell phone video. They say the 25-year-old victim fell to the ground helplessly while a small crowd of straphangers stood by. Some bystanders even fled, the video shows. Anyone with information is urged to call Crime Stoppers at 1-800-577-TIPS.