25 March 2015 Last updated at 10:40

In pictures: Alps plane search operation resumes

Helicopters of the French gendarmerie and emergency services fly over Seyne-les-Alpes

A search and recovery operation has resumed in the southern French Alps after Tuesday's crash of a Germanwings plane with 150 people on board.

Firefighters and members of the emergency services meet at dawn

Members of the emergency services met at dawn to start the work to recover the crash victims and the remains of the Airbus A320.

A rescue helicopter from the French Gendarmerie flies over the snow covered French Alps

Officials warn the operation could last for days in a remote mountain ravine between Digne and Barcelonnette.

French firefighters gather outside the gymnasium where relatives and officials are due to pay tribute to the victims of the Airbus A320 crash in Seyne-les-Alpes

French firefighters gathered outside the gymnasium in Seyne-les-Alpes where relatives and officials are due to pay tribute to the victims. French President Francois Hollande, German Chancellor Angela Merkel and Spanish Prime Minister Mariano Rajoy are expected to visit the crash scene later.

A poster reading "Yesterday we were many, today we are alone" can be seen in front of a memorial of flowers and candles near the Joseph-Koenig-Gymnasium secondary school in Haltern am See, western Germany

Sixteen teenagers on a Spanish exchange programme were among those on board the flight. The group, and two teachers, were from Joseph-Koenig school in Haltern, western Germany. A poster reading "Yesterday we were many, today we are alone" has been placed in front of a memorial of flowers and candles near the school.

Students gather at a memorial of flowers and candles in front of the Joseph-Koenig-Gymnasium secondary school

Students were sent home for the day, but some returned to lay flowers and comfort each other. Most of those who died from the school were girls aged about 16, an official told the BBC's Katya Adler.

Students hug in front of the Joseph-Koenig-Gymnasium high school in Haltern am See

"This is the worst thing imaginable," the town's Mayor Bodo Klimpel said at an emotional media conference. He said the school would still open on Wednesday, but instead of normal lessons there would be "an opportunity for the pupils to talk about this terrible [tragedy] and begin to process this".

Burning candles and pins of German airlines are placed by crew members in commemoration of the victims of Germanwings flight 4U9525 outside their headquarters at Cologne-Bonn airport

Burning candles and pins of German airlines Condor, Germanwings and Lufthansa were placed by crew members in commemoration of the victims outside the Germanwings headquarters at Cologne-Bonn airport.

A screen grab taken from an AFP TV video on 24 March 2015 shows debris of the Germanwings Airbus A320 at the crash site in the French Alps

Footage shot from a helicopter on Tuesday showed small plane parts scattered on the rocky mountainside. "The site is a picture of horror," German Foreign Minister Frank-Walter Steinmeier said after being flown over the ravine.

A screen grab taken from an AFP TV video on 24 March 2015 shows debris at the crash site of the Germanwings Airbus A320

"Everything is pulverised. The largest pieces of debris are the size of a small car," Gilbert Sauvan, president of the general council of Alpes-de-Haute-Provence, told the Associated Press.

A screen grab taken from an AFP TV video on March 24, 2015 shows search and rescue personnel near scattered debris while making their way through the crash site of the Germanwings Airbus A320

Using helicopters, a recovery team reached the site on Tuesday and later found the one of the two "black box" flight recorders - a key step in establishing what caused the crash. The interior ministry confirmed on Wednesday it was the cockpit voice recorder and had been damaged in the crash, although it could still provide information.

Debris scattered over the area after a Germanwings Airbus 320 crashed near Seyne-les-Alpes in the French Alps

Finding the second box - the flight data recorder - will be a key aim of Wednesday's search operation. A team of police officers spent the night on the mountain, securing the site.

In Pictures

In pictures: Alps plane search operation resumes

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