Tensions are running high in Ferguson, Missouri, as clashes between the police and protesters continue 10 days after 18-year-old Mike Brown was shot by a police officer. And the tension is starting to spill over on Twitter as well — even among think tanks and human rights organizations.

The Twitter account of the Center for Strategic and International Studies (CSIS), an influential Washington-based think tank, told Amnesty International to "suck it" in response to a tweet arguing that the U.S. needs to "clean up" its human rights record in light of what's happening in Ferguson, according to screenshots taken by multiple people on Tuesday morning.

Did this really just happen? pic.twitter.com/CkVEkrdoGH — Allen McDuffee (@AllenMcDuffee) August 19, 2014

The tweet was apparently a classic multi-account snafu, in which the operator of the CSIS Twitter feed intended to post with his own personal one but forgot to switch accounts, according to Andrew Schwartz, CSIS's Senior Vice President for External Relations. CSIS also acknowledged the tweet a little bit over an hour later.

Our sincerest apologies to @Amnesty & our followers. Our last tweet was sent in error. We're reviewing internal policies for social media. — CSIS (@CSIS) August 19, 2014

"This tweet was sent by a CSIS intern who had access to our Twitter account," Schwartz said in an email to Mashable. "This intern is not authorized to speak for CSIS and I condemn his words. Apparently, he had meant to send the tweet from his personal account and got confused in the process. The tweet in no way reflects CSIS's views or any views of the scholars at CSIS. I personally apologize to Amnesty and am taking action internally at CSIS to address this incident."

With more reports of police violence on the streets, both against protesters and members of the press, Amnesty International sent a team of human rights observers and organizers to Ferguson on Sunday to monitor police actions. The decision was "unprecedented" and the first time the global organization sends observers within the United States to monitor for human rights violations, according to a senior campaigner who is part of the Ferguson delegation.

This story has been edited to include Andrew Schwartz's statement