Video taken at the Democratic Party National Convention Thursday night shows boos cascading down on Hillary Clinton from the upper level of the Wells Fargo Center in Philadelphia as she began her acceptance speech for the party’s presidential nomination.

Reporter Tim Pool with Fusion posted video to Twitter of the protest and the group of mostly Black protesters in white t-shirts (as opposed to the yellow-shirt Bernie Sanders delegate protesters) being ejected from the arena.

Cassandra Fairbanks filmed the protesters right as they were thrown out of the arena.

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“Walk out from the convention #DNC”

Came running out of the convention, they were inside started booing her and got chased out by secret service #DNC pic.twitter.com/0LBSfIoMdF — Cassandra Fairbanks ✌️ (@CassandraRules) July 29, 2016

“Came running out of the convention, they were inside started booing her and got chased out by secret service #DNC”

UPDATE: California Bernie Sanders delegates filmed walking out of Clinton’s speech.

“California delegates are walking out mid Clinton speech #DNCDisaster #DNC”

Delegates: "every time you hear them chanting Hillary it's bc Bernie supporters are chanting 'no more war.'" #DNC pic.twitter.com/eV61vdGjlP — Cassandra Fairbanks ✌️ (@CassandraRules) July 29, 2016

“Delegates: “every time you hear them chanting Hillary it’s bc Bernie supporters are chanting ‘no more war.'” #DNC”

There are DNC volunteers here too now who chant "Hillary!" when the protesters start chanting. pic.twitter.com/780BH8YFOr — Emma Loop (@LoopEmma) July 29, 2016

BuzzFeed reporter Emma Loop confirms the counter-cheers and that they were done by DNC operatives.

There are DNC volunteers here too now who chant "Hillary!" when the protesters start chanting. pic.twitter.com/780BH8YFOr — Emma Loop (@LoopEmma) July 29, 2016

“There are DNC volunteers here too now who chant “Hillary!” when the protesters start chanting.”

Matthew Yglesias posted the official counter-chant instructions for Clinton delegates.

https://twitter.com/mattyglesias/status/758858618779217921

“These are the instructions for counter-chanting:”