French President Emmanuel Macron vowed France will continue to “fight against impunity” after a French journalist was killed by shell shrapnel while covering a Ukrainian evacuation operation.

The French national anti-terrorism prosecutor’s office opened an investigation for war crimes.

Frédéric Leclerc-Imhoff, 32, was killed Monday as he was covering a humanitarian operation near Sievierodonetsk, a key city in the Donbas region that is being hotly contested by Russian and Ukrainian forces, according to his employer, French news broadcaster BFM TV.

Macron, speaking after a European summit in Brussels, said “journalists, humanitarian workers must be protected in war zones. Civilians must be protected.”

Russia “is breaching all international laws,” he said.