This year’s Indianapolis 500 had plenty of excitement.

On the first lap after a yellow-flag period caused by Fernando Alonso’s blown engine, four drivers were involved in a massive accident Sunday at Indianapolis Motor Speedway.

Will Power, Oriol Servio, James Davidson and James Hinchcliffe were all collected in a pileup on the back straight on Lap 184.

All four drivers have been medically cleared and released from the infield care center. Despite all the smoke during this incident, this wasn’t the biggest wreck of the day.

Earlier in the race, Scott Dixon was sent airborne in a collision with Jay Howard.