In this file photo taken on Nov 1, 2021, Indonesia's President Joko Widodo presents his national statement as part of the World Leaders' Summit of the COP26 UN Climate Change Conference in Glasgow, Scotland. (ANDY BUCHANAN / POOL / AFP)

JAKARTA - Indonesian President Joko Widodo acknowledged on Wednesday a series of incidents amounting to "gross human rights violations" had taken place in his country's past, including the bloodshed and arrests that took place in 1965 and 1966.

In one of the darkest periods of Indonesia's history, some historians and activists have estimated at least 500,000 people were killed in violence that started in late 1965 after then-general Suharto and the military took power following an abortive communist coup. A million or more people were jailed, suspected of being communists.

"With a clear, genuine mind and conscience, I as a head of state acknowledge that there were gross human rights violations that did happen in many events," he said.

"And I strongly regret that those violations occurred."

Indonesian President Joko Widodo said that the government would seek to restore the rights of victims "fairly and wisely without negating judicial resolving", though did not specify how

The president, commonly known as Jokowi, cited 11 other incidents, spanning a period between 1965 and 2003 prior to his tenure as leader, including the shooting dead and abduction of students during protests against Suharto's three-decade rule in the late 1990s.

ALSO READ: Tsunami warning lifted after 7.6 magnitude Indonesia quake

Jokowi said that the government would seek to restore the rights of victims "fairly and wisely without negating judicial resolving", though did not specify how.

The president also cited human rights violations in the restive region of Papua, noting his acknowledgment came after reading the results received from a team he formed in 2022 to investigate these violations.

Some activists remained skeptical and said acknowledgment and expression of regret were not sufficient without cases being legally resolved in court and perpetrators tried, noting cases had often been thrown out by the Attorney General's Office, which is tasked with investigating rights violations.

READ MORE: Indonesian minister tells bankers to be wary of global risks

Any expression of regret must also include a reaffirmation that "serious crimes of the past need to be resolved rightly and justly through judicial means," said Usman Hamid of Amnesty International, adding victims needed to get reparation.

Previous presidents have also acknowledged such violations. Late President Abdurrahman Wahid apologized for the 1965 bloodshed, while President B.J. Habibie formed a team to investigate the violence in 1998.