Filmmaker Sepideh Farsi is still in shock after an Israeli airstrike killed her documentary's main subject, 25-year-old photojournalist Fatima Hassouna, in Gaza last month.
"Why would you kill someone and decimate an entire family just because she was taking photos?" she told Agence France-Presse (AFP) ahead of her film's premiere at the Cannes Festival Thursday.
With Israel banning foreign media from entering the besieged Palestinian territory, Farsi reached out to Hassouna through video calls, turning their conversations into "Put Your Soul on Your Hand and Walk."
A day after Hassouna was told it had been selected for a sidebar section at the world's most prestigious film festival, an Israeli missile pummelled into her home in northern Gaza, killing her and 10 relatives.
But "they were normal people. Her father was a taxi driver, she was a photographer, her sister was a painter and her little brother was 10 years old," said Farsi.
"My heart goes out to her mother, who lost six of her children, her husband and her home. She lost everything."
Tens of thousands of people have been killed in Gaza and an aid blockade threatens to cause famine.
As the death toll mounts, with rescuers saying 80 people were killed in Israeli strikes on Wednesday alone, the conflict has cast a shadow over Cannes.
Several actors have walked the red carpet wearing Palestinian flags pinned to their jackets.
Exiled Gazans, Arab and Tarzan Nasser, will screen "Once Upon a Time in Gaza" on Monday, a portrait of two friends set in 2007.
On the eve of the festival, "Schindler's List" actor Ralph Fiennes and Hollywood star Richard Gere were among more than 380 figures to slam what they see as silence over "genocide" in Gaza.
"The English Patient" actor Juliette Binoche, who heads the main competition jury, paid homage to Hassouna on opening night.
Sepideh said she had believed until the end that Hassouna "would survive, that she would come, that the war would stop."
"But reality caught up with us," she said.
Reporters Without Borders estimates that around 200 journalists have been killed in 18 months of Israeli strikes on Gaza.
