In a letter obtained by The New York Times, Mark Zuckerberg responded to a group of Myanmar activists who have criticized Facebook’s handling of material meant to incite violence in the country. But the groups continue to say Facebook isn’t doing enough.

Last week, Zuckerberg was interviewed by Vox’s Ezra Klein. During the interview, Zuckerberg was asked about violence in Myanmar, where investigators say Facebook drives hate speech against the minority Rohingya population. To illustrate Facebook’s work in the country, Zuckerberg described a situation where Facebook “systems” successfully flagged attempts to spread violence.

After the interview was published, Myanmar civil society groups released an open letter addressed to Zuckerberg, which said the groups themselves uncovered the messages. The letter further criticized the CEO’s characterization of Facebook’s work in Myanmar, saying the events showed the company had “an over-reliance on third parties, a lack of a proper mechanism for emergency escalation, a reticence to engage local stakeholders around systemic solutions and a lack of transparency.”

Zuckerberg said the groups have an “important role”

Zuckerberg’s new response to the groups’ letter apologized for the slight and highlighted their “important role” in the country. He said Facebook was adding dozens of Burmese-language reviewers, and that the company was bringing on more people dedicated to Myanmar issues.

But the groups, in another response, immediately criticized Zuckerberg’s letter, saying it “doesn’t change our core belief that your proposed improvements are nowhere near enough to ensure that Myanmar users are provided with the same standards of care as users in the U.S. or Europe.”

“When things go wrong in Myanmar, the consequences can be really serious — potentially disastrous,” the groups write. “You have yourself publicly acknowledged the risk of the platform being abused towards real harm.”

Here is a copy of Mark Zuckerberg’s email response:

Dear Htaike Htaike, Jes, Victoire, Phyu Phyu and Thant, I wanted to personally respond to your open letter. Thank you for writing it and I apologize for not being sufficiently clear about the important role that your organizations play in helping us understand and respond to Myanmar-related issues, including the September incident you referred to. In making my remarks, my intention was to highlight how we’re building artificial intelligence to help us better identify abusive, hateful or false content even before it is flagged by our community. These improvements in technology and tools are the kinds of solutions that your organizations have called on us to implement and we are committed to doing even more. For example, we are rolling out improvements to our reporting mechanism in Messenger to make it easier to find and simpler for people to report conversations. In addition to improving our technology and tools, we have added dozens more Burmese language reviewers to handle reports from users across all our services. We have also increased the number of people across the company on Myanmar-related issues and we now we have a special product team working to better understand the specific local challenges and build the right tools to help keep people there safe. There are several other improvements we have made or are making, and I have directed my teams to ensure we are doing all we can to get your feedback and keep you informed. We are grateful for your support as we map out our ongoing work in Myanmar, and we are committed to working with you to find more ways to be responsive to these important issues. Mark

And here is the Myanmar groups’ response: