ROUGH CUT (NO REPORTER NARRATION)

STORY: Algerian TV airs first images of freed hostages from a gas facility in Algeria where Islamist militants were holding them.

The footage shows several hostages speaking about their ordeal.

About 60 foreigners were still being held hostage or missing inside a gas plant on Friday after Algerian forces stormed the desert complex to free hundreds of captives taken by Islamist militants, who threatened to attack other energy installations.

The attack, which plunged capitals around the world into crisis mode, is a serious escalation of unrest in northwestern Africa, where French forces have been in Mali since last week fighting an Islamist takeover of Timbuktu and other towns.

A local Algerian source said 60 foreigners were still in the facility and some were being held hostage, but it was unclear how many and how many might be in hiding elsewhere in the sprawling compound. It was also not known whether some might have been killed and the bodies not found.

Those still unaccounted for included 10 from Japan, eight Norwegians and a number of Britons put by Cameron at "less than 30". Washington has said a number of Americans were among the hostages, without giving details, and the local source said a U.S. aircraft landed nearby on Friday.