"The brutal mass killing of Adivasis in Assam by armed extremists has deeply saddened me. I strongly condemn the heinous mass killing," Banerjee said in a post on Facebook.
"Many Adivasi families have started coming to our state for shelter. We have made necessary arrangements to help them and we will continue to do so," she said.
"Today on the day of Christmas symbolising peace and love, I appeal that ghastly acts of violence be stopped everywhere," the chief minister said.