The U.S. has gathered intelligence that shows some Russian officials have become concerned that Russian forces in the ravaged port city of Mariupol are carrying out grievous abuses, a U.S official familiar with the findings said Wednesday.

The Russian officials are concerned that the abuses will backfire and further inspire Mariupol residents to resist the Russian occupation. The U.S. official, who was not authorized to comment publicly and spoke on the condition of anonymity, said that the Russians, who were not identified, also feared that the abuses will undercut Russia’s claim that they’ve liberated the Russian-speaking city.

The abuses include beating and electrocuting city officials and robbing homes, according to the intelligence finding.