Khaled Saadi Ndiaye and Gregory Reibenberg marched together for loved ones killed in Paris attacks

Halima Saadi Ndiaye was in a cafe where her brother worked celebrating her 36th birthday when terror took over. Within a minute, she was dead. Within hours, her sister Hodda was, too.

Her brother Khaled tried in vain to save them.

The memory tortures him, along with worry about the future of his neighbourhood, a place proud of its diversity and tolerance.