Two American nationals and two infants were confirmed by authorities to be among the 150 people believed killed when a Germanwings jetliner they boarded went down in the Alps.

The names of the two Americans have not been immediately released as authorities were still trying to contact their relatives in the United States, Germanwings CEO Thomas Winklemann told reporters in a news conference in Cologne, Germany.

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Aside from the two Americans, Winklemann also confirmed that among those who were killed were two infants, two opera singers and 16 German high school students.

The partial list of passenger nationalities released by Germanwings include 72 Germans, 35 Spaniards, two victims each from Australia, Argentina, Iran and Venezuela and one each from Britain, the Netherlands, Colombia, Mexico, Japan, Denmark, Belgium and Israel.

The nationalities of some of the victims were not immediately established because of dual nationality, said Winkelmann.

Search and recover operations resumed Wednesday at the high-altitude site. Video footage, however, did not show any huge chunk of the plane that crashed.

Instead, what was shown were small debris of the plane, which made authorities to believe that no one survived the crash.

The cockpit voice recorder was recovered Tuesday but was in a damaged state, said French Interior Minister Bernard Cazenueve.

The second black box has not been recovered as of this posting.

The CEO of Lufthansa, which owns Germanwings, said a full analysis of the voice recorder was expected to be done by Thursday.

The cause of the crash has not yet been determined, the Germanwings CEO said. Lufthansa called the crash "an accident."

Germanwings Flight 9525 was a scheduled international passenger flight from Barcelona to Düsseldorf, operated by the Lufthansa-owned low-cost airline Germanwings.

On 24 March 2015, the aircraft serving that flight, an Airbus A320-200, crashed around 100 kilometres (62 mi) northwest of Nice, in the French Alps. All the passengers and six crew died.

TagsGermanwings, Germanwings Flight 9525