I got fired for fraud returns for myself and others. I was called in to write a statement with no police around. I was told I would receieve a letter

It is best for you to consult with a lawyer as quickly as possible. Your statement can be used against you if you admitted to any wrongdoing and you should not talk to anyone without representation. When you say you were accused of filing fraudulent returns for yourself and others I assume you mean tax returns. If so, this is potentially a federal crime and very serious with prison a distinct possibility. Contact me if you have any questions.