Freed Norwegian hostage Oddvar Birkedal is escorted at a police station in Amenas, Algeria, on Saturday.
- NEW: Sixteen Filipinos are accounted for and confirmed alive
- No known French hostages are unaccounted for, defense ministry says
- At least one American is among the dead
- Algerian prime minister to provide more details Monday
(CNN) -- After a fiery end to an Algerian hostage standoff that transfixed the world last week, harrowing tales of escape trickled in, together with casualty numbers.
The exact toll is unclear after the nation's special forces stormed the gas complex in the desert to free hostages held by Islamist militants for four days.
At least 23 hostages and dozens of militants died in the hostage standoff, which ended Saturday when the forces ambushed the militants.
About 800 workers were freed, including more than 100 foreigners.
One-eyed veteran Islamist fighter Mokhtar Belmokhtar has claimed responsibility for the hostage standoff on behalf of his al Qaeda-linked group, according to Mauritania's Sahara Media news agency.
He said it was in retaliation to Algeria for allowing France to use its airspace to battle Islamist militants in neighboring Mali.
As world leaders work to return their citizens back home, more questions remain.
What did the Algerian government find after securing the scene of the standoff this weeked?
Exactly how many people are dead and unaccounted for?
Algerian Prime Minister Abdelmalek Sellal is expected to provide an update at a news conference Monday.
Meanwhile, here is the latest breakdown on the international hostages:
Colombia
Colombia's president said a citizen was presumed dead.
France
No known French hostages are unaccounted for, the defense ministry said.
A man identified as Yann Desjeux died after telling French newspaper Sud Ouest that he and 34 other hostages were treated well. It was unclear what led to his death.
Japan
Ten Japanese remain unaccounted for, according to JGC, a Yokohama-based engineering firm. Japan is sending a second team that includes doctors to the scene of the standoff. Other government officials have been at the site since last week.
Malaysia
Three hostages were on their way back home, state media reported. There is a "worrying possibility" that another is dead while a fifth is unaccounted for, the agency said.
Norway
Five Norwegians are missing, while eight are safe, according to the Norwegian Prime Minister.
Philippines
Six Filipinos are confirmed dead and four are missing, the nation's foreign affairs ministry said. In addition, 16 Filipinos are accounted for and confirmed alive, according to a ministry spokesman.
Romania
One Romanian lost his life while four others were freed, the country's foreign ministry said.
United Kingdom
Three British citizens were killed, the Foreign Office said Sunday. Three other British nationals and a UK resident are also "believed dead," he said. Twenty-two other Britons who were taken hostage have safely returned home.
United States
At least one American, identified as Frederick Buttaccio, is among the dead, the State Department said. Six freed Americans left Algeria and one remained.
Read more: Algeria attack may have link to Libya camps
CNN's Yoko Wakatsuki contributed to this report.
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