A Seattle-area high school teacher who was pepper-sprayed by police at a rally on Martin Luther King Jr. day has filed an intent to sue the city and its police force for $500,000.

Jesse Hagopian, a well-known social justice advocate who teaches at Garfield High School, a public school in Seattle, Washington, filed the notice of tort claim against the City of Seattle and the Seattle Police Department over the incident, which was captured on camera and shared on YouTube this week.

The city has 60 days to respond.

In the video, Hagopian — in the brown jacket — can be seen calmly walking in front of a line of Seattle police officers while talking on his phone. As he passes them, a female officer, waving a can and yelling "Step back! Step back!" to no one in particular, hits him with a blast of pepper spray.

Here's that moment:

Hagopian had just finished giving a speech at King County's annual Martin Luther King, Jr. celebration about how black lives matter and was on the phone with his mother when he was pepper-sprayed, his lawyer, James Bible, told Mashable. They were discussing plans for his two-year-old's birthday party that was scheduled later that day.

"His eyes begin to burn, his nostrils began to burn, he felt pressure in his ear and he had difficulty breathing," Bible said, adding that the teacher spent most of the afternoon washing his eyes out with milk. The party was canceled. Hagopian's six-year-old was said to be deeply concerned.

"Thankfully someone caught it on video and now everyone can see what happened," Hagopian wrote in a Facebook post after the incident.

In another post he added: "The milk has helped a lot and I'm beginning to feel better. Wish we had a better world."

Seattle Mayor Ed Murray said the incident was under investigation.

"Under the accountability system that we’ve set up, the uses of force that occurred during the MLK protests are currently under review and being investigated," he said in a statement published on his website on Jan. 28.

The statement said that people should be able to protest peacefully and exercise their constitutional right to freedom of expression while police are "given the resources, support and training necessary" to "protect the public’s safety at these protests."

Hagopian's lawyer, however, doesn't have much faith in the city's ability to hold itself accountable.

"They're not going to respond," Bible said on Friday afternoon. "I would not be surprised if the city of Seattle finds yet another way to absolve itself of any wrong-doing. They've made a mockery of accountability and until that changes, we're not holding our breath."

He expects to file a federal lawsuit shortly after the 60-day period is up.