One suspect questioned in court, Mahmoud Kechouri, said he helped plan the Bardo attack, including preparing mobile phones for Sandi, a neighbour and longtime friend.
Several defendants pointed to the fugitive Chamseddine Sandi as mastermind of both.
Some of those who testified acknowledged ties to the man considered the orchestrator of the attack, Chamseddine Sandi, saying he asked them to case out the area ahead of time.
Among the 19 defendants who appeared in court were friends of suspected mastermind Chamseddine Sandi, including his brother Achraf Sandi.
He and his wife Sandi have four grown children, and three grandchildren.” State transportation officials referred queries to the Highway Patrol, which did not respond to requests for information.