DENVER - Denver Police are trying to determine why multiple motorcycles collided on northbound Interstate 25 around 3 a.m.
Officers told 7NEWS two of the drivers were taken to the hospital with serious injuries.
A half dozen police cars blocked lanes of I-25 near 8th Avenue for more than 90 minutes while officers investigated.
Police do not yet know what caused the three motorcycles to collide. Initial reports said no cars were involved in the crash, just the motorcycles.