Actor Allu Arjun, following his release from jail on Saturday, said he is a law-abiding citizen and will cooperate in the probe into the 'Pushpa 2' screening stampede in Hyderabad that killed a woman and seriously injured a child. "I want to thank all my fans. There is nothing to worry about. I would like to once again express my condolences to the family. It was an unfortunate incident. We are sorry for what happened," he said.