Three men have been found guilty of charges relating to the Garissa University attack in Kenya in 2015.
Rashid Charles Mberesero, Mohamed Ali Abikar and Hassan Edin Hassan were found guilty of conspiracy to commit the attack in which four gunmen killed 148 people, mainly students.
They were also found guilty of belonging to Somalia’s al-Shabab Islamist militant group.
A fourth man, Sahal Diriye Hussein, was acquitted of the charges.
All four men are Kenyan nationals.
The attack was carried out by al-Shabab, a group affiliated to al-Qaeda, at the north-east Kenyan university in April 2015.
It was the second deadliest attack in Kenya’s history, following the al-Qaeda bombing of the US embassy in 1998, which killed over 200 people.
By attacking young, future professionals, the massacre aimed to disrupt the country’s socio-economic growth and stability, as well as divide a multi-faith country, analysts say.
The four gunmen were killed at the scene and the man who plotted the attack, Mohamed Kuno, was killed in a raid in Somalia in 2016.
Kenyan authorities were criticised for not investigating intelligence in the lead-up to the attack, as well as responding poorly when it occurred.
A long wait for justice
Emmanuel Ingoza, BBC Africa, Nairobi
Victims of the attack like Anastasia Mikwa still bear visible and hidden scars. The 23-year-old former Garissa University student was shot multiple times in the attack. Despite undergoing 32 surgeries she still relies on care and support from her parents.
Today’s judgement will offer little, if any, reprieve to victims like her and their families.
There will, however, be a sense of closure for a case that has dragged on for nearly four years.
The trial had been beset by changes of magistrates and witnesses not showing up in court; a situation typical of the Kenyan justice system.
The ruling today is hugely significant. This was after all the deadliest attack on Kenyan soil since the 1998 US bombings.
The conviction is also in some ways a victory for the Kenyan police and prosecutors who have constantly faced accusations of botching high-profile cases like this one.
During the attack, gunmen fired indiscriminately as well as singling out and shooting those who identified as Christians.