French President Francois Hollande is to meet relatives of those killed in November's jihadist attacks in Paris, in the wake of the capture of alleged organiser Salah Abdeslam.
Support groups for victims say they hope his capture in Brussels on Friday will help in the search for the truth.
So-called Islamic State said it carried out the attacks, that left 130 dead.
Belgian officials say Abdeslam, who is still being interrogated, was planning more attacks in Belgium.
The BBC's Lucy Williamson in Paris says that for those who lost relatives in the attacks, relief at Salah Abdeslam's arrest is quickly turning to hunger for the information he might provide.
"We hope [his arrest] will help us in the search for truth" read the message from one support group set up after the November attacks. Read more...
Image credit: Reuters