The questioning of former Sierra Leone leader, Ernest Bai Koroma, took place on Monday in a secure location after his lawyers expressed safety concerns last week.
Mr Koroma is being questioned over corruption and money laundering allegations during his term in office. He has in the past denied any wrongdoing.
The country's anti-corruption body said the interview with the former president was conducted well and will continue at a later date agreed with his lawyers.
In October, investigators were blocked by supporters of the former leader from accessing his home for questioning.
Mr Koroma failed to honour summons and the anti-corruption body said it was considering issuing an arrest warrant against him.
His party on Monday urged supporters to remain calm.
After the questioning, Mr Koroma shared pictures of him and his supporters.