While covering the various protests against police brutality nationwide, one incident in particular stood out to us. On June 1 in Philadelphia, a protest that began peacefully ended with police using tear gas and pepper spray on the crowd. https://nyti.ms/2VkEUA1 

We watched dozens of videos, reviewed police use of force guidelines and spoke with witnesses to understand how this unfolded. Here’s what we found. https://nyti.ms/2VkEUA1 

More than a thousand protesters begin marching. Shortly before 5 p.m., some of them enter the I-676 highway. We don’t see any signs of violence. Then the police move in to clear the road. https://nyti.ms/2VkEUA1 

We saw a protester getting pepper sprayed directly in the face by the police. We found him and interviewed him to understand what happened that day. https://nyti.ms/2VkEUA1 

Then we saw an egregious use of tear gas. Protesters complied and were trying to leave the highway but they got stuck at a dead end. https://nyti.ms/2VkEUA1 

Drew Underwood was one of the protesters who was trapped on the hill while police were firing tear gas. He said he was shot in the face by a projectile fired by the police. https://nyti.ms/2VkEUA1 

Thanks to Drew, Diamonik, Elias and Callan for speaking with us. And to Sunny Singh for sharing his footage. This story was produced by me, @ckoettl, @muyixiao, with graphics by @drewjordan_NYT & senior produced by @bottidavid & @whitney_hurst. https://nyti.ms/2VkEUA1 

Twitter character limit got me, but this was edited by the always excellent Natalie Reneau.