AFP: At least 13 foreigners currently held by Abu Sayyaf

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Canadians identified as Robert Hall and John Ridsdel and Norwegian Kjartan Sekkingstad (L-R) reportedly appeared in a video pleading for their governments to pay ransom within the one-month deadline set by the Abu Sayyaf Group – or the terrorists would kill them.

NOTE: Armed Forces of the Philippines (AFP) spokesman BGen. Restituto Padilla says the Abu Sayyaf is holding 13 foreign hostages kidnapped between February 1, 2012 and April 15, 2016. He says it is still unclear if the ASG also are holding four Malaysians seized in waters between Tawi-Tawi and Sabah on April 1, and four Indonesian tugboat crew members abducted off Tawi-Tawi on April 15.

Metro Manila (CNN Philippines) — At least 13 foreign nationals are in the hands of terror group Abu Sayyaf, according to the Armed Forces of the Philippines (AFP).

AFP spokespersons BGen. Restituto Padilla and Col. Benjamin Hao gave CNN Philippines a list on April 6 of 15 foreigners and one Filipina who were then held by the Abu Sayyaf Group (ASG). On Tuesday (April 26), the number went down to 13 foreigners following the killing of Canadian John Ridsdel and the recovery earlier of an Italian hostage.

The remaining captives are:

1 Dutch: Ewold Hurn

1 Canadian: Robert Hall

1 Norwegian: Kjartan Sekkingstad

10 Indonesians: Peter Tonsen Barahama, Julian Philip, Alvian Elvis Peti, Mahmud, Surian Syah, Surianto, Wawan Saputra, Bayu Octavianto, Reynaldi, Wendi Raknadian

The original list included former Italian missionary Rolando del Torchio, who was abducted in October 2015 from his bar-cafe in Dipolog City, Zamboanga del Norte. He was recovered by Sulu provincial police forces on April 8.

Also read: Abducted Italian recovered by authorities at Jolo port

Also on the list was Ridsdel who was abducted from a resort on Samal Island, Davao City, in September 2015, together with Hall, Sekkingstad and Flor.

Officials confirmed that Ridsdel was beheaded on Tuesday (April 26).

The four Malaysians seized in waters between Tawi-Tawi and Sabah on April 1, and four Indonesian tugboat crew members abducted off Tawi-Tawi on April 15 are not yet on the AFP list of foreign hostages as of Friday (April 29).

Padilla said “it is hard to confirm” if the Abu Sayyaf also are behind the two most recent attacks.

“That’s why we use the term kidnap-for-ransom groups (KFRG),” Padilla said, explaining that what is certain is that the Malaysians and Indonesians are being held by a KFRG in Sulu province.

In an October 2015 video, Ridsdel said the militants were demanding P1 billion ($21 million) for each one seized from the Samal Island resort.

The three men appeared in a video that circulated in March, pleading to their governments to pay ransom within the one-month deadline set by their abductors – or the terrorists would kill them.

"We extend our sympathy and condolences to the Canadian government and to the family of Mr. John Ridsdel who died in the hands of the ASG bandit," the police and the military said in a joint statement.

From left: Kjartan Sekkingstad, John Ridsel, Robert Hall, and Marithes "Tess" Flor

WATCH: Gunmen abduct Filipina, foreigners from Samal resort

Padilla said ransom is the "primary motivation” for the kidnappings.

AFP not cowed by threats

The AFP has assured the public it is not easing up on the pursuit of the abductors.

“Focused military operations continue in known havens of Kidnap for Ransom (KFR) groups. There has been no let-up in these activities and our primordial consideration is the safety of kidnap victims,” Padilla told CNN Philippines on Wednesday.

Related: Malacañang reiterates 'no ransom policy' amid Abu Sayyaf threat

“We will not be cowed by these threats and will remain focused on achieving our mission of making these criminals accountable for their evil acts and hopefully ending this criminal activity with the help of the LGUs (local government units).”

Related: 'Intense rescue effort' launched for abducted foreigners

The Western Mindanao-based ASG has been blacklisted by the United Nations Security Council for its ties with the Al Qaeda network and has been declared a terrorist organization by several governments, including Australia and the United States.

Watch: What is the Abu Sayyaf Group?

CNN Philippines Gerg Cahiles and Reuters contributed to this report.