The Arizona Department of Public Safety says approximately 20 vehicles were involved in a crash that was blocking the ramp from SR-51 to I-10 early Friday morning.

According to DPS, a vehicle collided with a concrete barrier wall on the SR 51 at the I-10 HOV fly-over ramp just before 5 a.m.

DPS said a "multiple vehicle secondary collision occurred" after that initial crash which could involve about 20 vehicles.