The group said that Obe's accusation was a ploy to destabilize the state due to his purported desire to become deputy governor.
In a statement, OEA General Secretary Yemi Oladiran voiced displeasure with the way the claim of falsified signatures was made and purportedly looked into, saying it raised questions.
Obe had alerted the State Government (SSG) on Friday of the purported forgery of the governor's signature on several documents he had obtained from the Secretary of State's office.
In a correspondence to Lucky Aiyedatiwa, the Deputy Governor, informing him of the event, the commissioner disclosed that forensic specialists had also verified the falsified signature.
The governor's aides did not return calls or mails regarding the matter, thus 24 hours after Obe's claim, the state government was still silent on the accusation.
The group emphasized that forgeries are crimes that belong only to security agencies to address and look into.