The arrest of two black men sitting in Starbucks sparked protests in Philadelphia over the weekend — and now the movement to boycott Starbucks is going global.

Last Thursday, a Starbucks manager in Philadelphia called the local police because two black men were sitting inside the cafe without having ordered anything. The incident resulted in the two men being arrested, which drew an apology from Starbucks CEO Kevin Johnson and protests outside the branch of Starbucks in question on Sunday. Now there is a call on Twitter to #BoycottStarbucks.

Here’s what you need to know about the ongoing backlash against Starbucks due to last week’s arrests.

Why were 2 men arrested at a Starbucks in Philadelphia?

The official reason was trespassing because they hadn’t ordered anything. But an eyewitness told NBC News she had been sitting next to a white man who had been in the cafe for 30 minutes without making a purchase, and that a jogger had come into the store earlier to use the bathroom without making a purchase. She said the men had been sitting quietly and playing with their phones. It was later reported that the two men were real estate developers waiting to meet an investor.

Another eyewitness posted a video of the Philadelphia Starbucks incident on Twitter:

@Starbucks The police were called because these men hadn’t ordered anything. They were waiting for a friend to show up, who did as they were taken out in handcuffs for doing nothing. All the other white ppl are wondering why it’s never happened to us when we do the same thing.— Melissa DePino (@missydepino) April 12, 2018

Why are people protesting Starbucks?

Some Philadelphians thought Johnson’s apology was “too little, too latte,” as written on one protest sign, and met outside the Starbucks where the arrests took place to protest. Soon, people around the country and around the world were joining the call to #BoycottStarbucks and for the firing of the manager who called the police.

The Mayor’s Office, the Philadelphia Police, and Starbucks are all conducting separate investigations of the incident.

Here’s useful chart that’ll show you if it’s okay to wait in a @Starbucks for a friend #BoycottStarbucks— David Leavitt (@David_Leavitt) April 14, 2018

In January, Starbucks' Board of Directors unanimously called on shareholders to vote against the creation of annual reports on diversity + paid leave + sustainable packaging, but asked for massive increases in executive pay. Corporations are not our friends. #BoycottStarbucks— Tyler Kissinger (@tylerbkissinger) April 16, 2018

I hope you see how @starbucks is treating black people @Starbucks_SA we will organise a full boycott of South African franchise in solidarity with the Afro American peoples struggle. #boycottstarbucks— Fuckken: Ghost of stompie #Stratcom. (@Siyanda_Mbatha1) April 16, 2018

Sorry. Apology not accepted @Starbucks Until you fire all that staff AND make the person apologize in PERSON to them, you ain't getting me one step in your place. #BoycottStarbucks— WhatTheEff? (@WhatEvahUThink) April 15, 2018

Not everyone is sure about #BoycottStarbucks

Stand-up comic and television host W. Kamau Bell wrote in a long Twitter thread that the apparent discrimination in this case isn’t unique to Starbucks. He recounted an occasion when he was asked to leave a cafe in Berkeley, Calif. where he had stopped to talk to his Caucasian wife and a friend of hers. The incident resulted in two employees being fired, but as he described on Twitter, “Firing the employees doesn’t do anything. It makes the employees scapegoats & let’s (sic) the company off the hook.”

Bell advised his followers to make sure their local cafes “aren’t assholes” before subbing them in for Starbucks.