On the sidelines of a United Nations luncheon on Saturday, Merkel was caught on a hot mic pressing Zuckerberg about social media posts about the wave of Syrian refugees entering Germany, the publication reported.

German Chancellor Angela Merkel was overheard confronting Facebook CEO Mark Zuckerberg over incendiary posts on the social network, Bloomberg reported on Sunday, amid complaints from her government about anti-immigrant posts in the midst of Europe's refugee crisis.

The Facebook CEO was overheard responding that "we need to do some work" on curtailing anti-immigrant posts about the refugee crisis. "Are you working on this?" Merkel asked in English, to which Zuckerberg replied in the affirmative before the transmission was disrupted.

In recent weeks, hundreds of thousands of Syrian refugees have washed up on Europe's shores, seeking asylum from the raging civil war in their homeland. As Europe's largest economy, Germany has sheltered the majority of them, leading to widespread objections within the country.

Earlier this month, Facebook vowed to clean up what it deemed was racist content on the German version of its website. At the time, the social network said it would partner with a non profit group to oversee hate postings.

Yet any action from Facebook is likely to stoke concerns about free speech. In the past, the social network has come under suspicion for suppressing or deleting posts and groups that advocate unpopular beliefs.

Bloomberg's full report can be found on its website.