The deceased were identified as -- Suresh (26), M Senthil (25) and B Swami (35).
All three were residents of JJ cluster in Moti Bagh and returning after watching a movie in Naraina when the incident took place near south-west Delhi's Subroto Park area.
The police said that none of them was wearing helmets and the bike was apparently trying to take a U-turn from the wrong side on the flyover when their vehicle rammed into the divider.
"The bike was damaged from the front only, which suggests collision and the impact points towards over-speeding. Family members of the victims have been informed and the bodies were sent for autopsy," a senior police officer said.
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Police said that they got a call from nearby residents at 2.50 am about the accident and all three were rushed to AIIMS trauma centre where they were declared brought dead.
Senthil was driving the vehicle. As the bike rammed into the divider, Senthil hit the railing and his skull was fractured. Suresh also succumbed to severe head injuries and Swami died due to spine and neck injuries, they said.