The mother of Ali Salim Gichuge, suspected to have been involved in the Riverside attack, bore the brunt of her son's crime when the court ordered that she be detained for 30 days.
Sakina Mariam Abdalla was detained to allow authorities to conclude investigations on the Riverside attack.
She had been arrested in Isiolo County on Friday after police intensified the operation to uncover everyone involved in the raid.
Sakina told detectives that she last saw Salim in 2016 before he disappeared.
Police have, however, stated that they needed someone to corroborate her story.
She had been arraigned among three other suspects namely; Muktar Ibrahim, an Imam from Mandera, Isaak Hussein, an Ethiopian who claimed to be his student, and George Ndung'u.
Ibrahim is accused of facilitating the transport of the attackers from Mandera.
"It is believed that he will aid investigators to narrow down on the identity and operation of the attackers,” anti-terror police inspector Monica Githaiga stated.
While the rest will be detained for 30 days, Ndung'u will only be in custody for 10 days.
So far, the authorities have arraigned more than seven suspects in connection with the attack.
