Police say it was a seven-vehicle crash and a major fuel spill that kept the eastbound 403 on lockdown for most of Wednesday.

Two people were injured in the collision, which snarled the morning commute and spurred two other crashes on city streets as drivers tried detours to escape the mayhem.

The 403 crash happened at 6:30 a.m. near Waterdown Road just past the ramp to Highway 6.

OPP Constable Graham Williamson says a driver who was losing power tried to move his vehicle onto the right shoulder.