The accounts of hostages who escaped the standoff showed they faced dangers from both the kidnappers and the military.
Ruben Andrada, 49, a Filipino civil engineer who works as one of the project management staff for the Japanese company
, described how he and his colleagues were used as human shields by the kidnappers, which did little to deter the Algerian military.
On Thursday, about 35 hostages guarded by 15 militants were loaded into seven SUVs in a convoy to move them from the housing complex to the refinery, Andrada said. The militants placed "an explosive cord" around their necks and were told it would detonate if they tried to run away, he said.
"When we left the compound, there was shooting all around," Andrada said, as Algerian helicopters attacked with guns and missiles. "I closed my eyes. We were going around in the desert. To me, I left it all to fate."
Andrada's vehicle overturned allowing him and a few others to escape. He sustained cuts and bruises and was grazed by a bullet on his right elbow. He later saw the blasted remains of other vehicles, and the severed leg of one of the gunmen.
The site of the gas plant spreads out over several hectares (acres) and includes a housing complex and the processing site, about a mile (1.6 kilometers) apart, making it especially complicated for the Algerians to secure the site and likely contributed to the lengthy standoff.
"It's a big and complex site. It's a huge place with a lot of people there and a lot of hiding places for hostages and terrorists," said Col. Richard Kemp, a retired commander of British forces who had dealt with hostage rescues in Iraq and Afghanistan. "These are experienced terrorists holding the hostages."
While the Algerian government has only admitted to 23 hostages dead so far, the militants claimed through the Mauritanian news website
that the helicopter attack alone killed 35 hostages.