In the wake of Trump’s victory on Tuesday, anti-Semitic vandalism, hate speech and violence have been reported across the country.

The news isn’t unlike the aftermath of June’s Brexit vote, when immigrants suffered a 57 percent increase in xenophobic harassment and abuse. At the time, Brits started wearing safety pins to show solidarity and support for anyone who felt scared or in danger. Now Americans have adopted the same gesture.

#SafetyPin and #SafetyPinUSA began trending on Twitter Thursday night. Users posted pictures wearing a pin attached to their coat, or sweater, declaring themselves an ally in the fight against intolerance.

The trend originated when an American living in Britain during Brexit posted the suggestion on Twitter, writing “that anyone against the sort of nationalistic, racist violence we’ve been seeing could identify themselves as a ‘safe ally.’”

The user, who only ever identified herself as Allison, tweeted that she was inspired by the #illridewithyou movement in Australia. The hashtag began trending after the 17-hour hostage situation inside a Sydney cafe that left three, including radical Islamist gunman, dead. People offered to sit or walk with Muslims who felt threatened, or nervous of a backlash, on their commutes.

“If you put the pin on, to me you are pledging to stand up,” she told the Guardian in June. “You are pledging to make a difference.”