Appearing unruffled over the flak his attack on Jnanpith awardee Kannada writer Chandrashekara Kambara has drawn in neighbouring Karnataka, Shiv Sena chief Bal Thackeray on Wednesday warned of a "backlash" in Maharashtra. "Those ruling Karnataka should check the goondas indulging in anti-Marathi activities. Don't let them spark a fire here," Thackeray said. "The Karnataka government should stop police protection to the goondas attacking Marathi," he said.