He produced a signed statement from the prisoner.
statement
noun [C] /ˈsteɪt.mənt/
B2 something that someone says or writes officially, or an action done to express an opinion:
The government is expected to issue a statement about the investigation to the press.
He produced a signed statement from the prisoner.
He threw paint over the fur coats because he wanted to make a statement about cruelty to animals.
[+ that] We were not surprised by their statement that the train services would be reduced.