Thousands of Google employees walked out Monday in protest of Donald Trump's executive order banning refugees from several Muslim-majority nations.

Google told Mashable in an email that more than 2,000 Googlers turned up to protests at several company offices, including at the main Google campus in Silicon Valley, San Francisco and New York.

The biggest turnout was at its headquarters in Mountain View, California, where CEO Sundar Pichai and cofounder Sergey Brin spoke to the crowd.

Over the weekend, Brin was also seen at a mass protest at San Francisco International Airport as part of protests at airports across the country, where refugees and visa holders were being turned away or detained.

Brin told the crowd in Mountain View Monday that he was "outraged" by the order as a immigrant and refugee himself, who came to this country at age six from the Soviet Union. He talked about protesting at the airport Saturday night and said he was "glad to see ... that people are fighting for what's right out there."

Monday's walk-out was employee-led, but Google said the company supported the demonstrations.

Since Trump's order went into effect Friday, Pichai emailed Google staff and said the decision affected at least 187 employees. Google also created a $2 million crisis fund that employees can match in donations up to another $2 million. Monday's Google Doodle was also a subtle commentary on Trump's decisions.

After the weekend, the hashtag #GooglersUnite was paired with the #NoBanNoWall hashtag used globally to protest Trump's immigration policies. In Washington, D.C., the #NoBanNoWall effort also came to life at a rally Monday evening in front of the Supreme Court.

Googlers used the hashtags for their walk-outs at offices across the U.S.

Here's the scene in Mountain View

Incredible scenes at Google headquarters today. Thousands came to #GooglersUnite protest on less than 1 day notice #NoBanNoWall #NoMuslimBan pic.twitter.com/pBaIWmluoD — Tolu Thomas (@ToluThomas) January 31, 2017

Even the autonomous cars came out to protest today @Google. So proud to be part of this company. ❤️ #GooglersUnite #NoHateNoFear pic.twitter.com/jOpHzEGE0J — Ashley Cornall (@ashleycornall) January 30, 2017

Vice-mayor of Mountain View at Google in support of protest #GooglersUnite pic.twitter.com/Hj9XLOzAh5 — William Hester (@WilliamHester) January 30, 2017

And in New York





Google walk-out in NYC supporting refugees, against a border wall #GooglersUnite pic.twitter.com/etIgagmVoh — Sidney (@Sidnicious) January 30, 2017

San Francisco also saw strong protests

Google employees in SF staging a protest against the racist immigration moves of the administration #NoMuslimBan #NoWall #GooglersUnite pic.twitter.com/WDUAP5ZiCJ — Fabien (@EconVigilante) January 30, 2017

Respect to @Google employees for their protest today around 8 US offices! #NoBanNoWall #googlersunite — Timea Bara (@Timea_in_CA) January 30, 2017

Google has 70 offices in 40 countries around the world, with about 20 in the U.S. Reportedly eight Google offices worldwide walked out Monday in solidarity.