German Chancellor Angela Merkel was overheard on a hot mic confronting Facebook CEO Mark Zuckerberg over anti-immigrant posts, amid complaints from her government that the social network isn’t doing enough to curtail racist comments.

The two were overheard exchanging words on a live transmission broadcast on the United Nations website, as participants took their seats at a U.N. development summit in New York on Saturday, Bloomberg reported.

After Ms. Merkel asked Mr. Zuckerberg about offensive posts on the refugee crisis, the Facebook CEO said “we need to do some work” on the issue.

“Are you working on this?” Ms. Merkel asked in English, Bloomberg reported.

“Yeah,” Mr. Zuckerberg reportedly responded, before the transmission was disrupted.

A surge of Syrian refugees seeking asylum in Germany has spurred a spate of attacks on refugee centers and anti-immigrant sentiment, Bloomberg reported. Earlier this month, Facebook vowed to clean up racist content on its German website by partnering with a German Internet watchdog, called Voluntary Self-Monitoring of Multimedia Service Providers, to monitor suspected hate postings.

“We are committed to working closely with the German government on this important issue,” Facebook spokeswoman Debbie Frost told Bloomberg. “We think the best solutions to dealing with people who make racist and xenophobic comments can be found when service providers, government and civil society all work together to address this common challenge.”

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