Sunday Tribune had exclusively reported the commencement of the probe by the police weeks back.
A security source revealed that Ambode was quizzed on Wednesday at the Force Headquarters in Abuja.
He was reportedly released on administrative bail after he was said to have made his statement on oath.
The police team handling the investigation reportedly issued a formal summons on him which he reportedly honoured.
The Certified True Copy (CTC) of the documents involved in the alleged forgery was also said to have obtained by the investigative team.
The CTC of the nomination form with the Independent National Electoral Commission (INEC) was reportedly obtained from the commission, while the CTC of the Joint Admissions and Matriculation Board (Jamb) form he filled in 1981, was reportedly obtained from the University of Lagos.
According to security sources, investigation had been concluded and a criminal charge would soon be preferred.
Sunday Tribune gathered that the petition alleging perjury against him was authored by Lagos APC integrity group.
The petitioners accused him of lying on oath by claiming in his JAMB form in 1981 that he was from Ilaje in Ondo State, only to claim in his nomination form, on oath again, to be from Epe in Lagos State.
Ambode, backed by the party's national leader, Senator Bola Tinubu, defeated 12 others to clinch the party's ticket.
There are two cases at the Federal High Court in Lagos, challenging the process and conduct of the exercise.
When contacted, Ambode's media aide, Idowu Ajanaku said he was not aware of the visit.
