People across Kenya are marking the first anniversary of the massacre of 148 people at Garissa University.
Thousands gathered at the college on Saturday, with about 100 taking part in a run to commemorate the victims.
Prayers and candlelight vigils will be held later in Garissa and in the capital, Nairobi, where President Uhuru Kenyatta is expected to attend.
Four al-Shabab militants shot students in their dormitories before rounding up and killing dozens more.
It was the deadliest attack in Kenya since al-Qaeda’s bombing of the US embassy in Nairobi in 1998, which killed 213 people.
Al-Qaeda-linked al-Shabab, which is based in neighbouring Somalia, has carried out a number of attacks against Kenyan targets.
The group says it is retaliating for acts by Kenya’s security forces, who are part of the African Union’s mission in Somalia against al-Shabab.
The participants in the commemorative run wore T-shirts bearing peace slogans.
One of the organisers of the run, Ali Awdoll, told the BBC the attack had made a lasting impression on the residents of Garissa.
“As we try to mourn the innocent lives, it’s like it happened yesterday. The images of the dead bodies keep on playing in my mind. It was really a traumatising experience.”
He said the runners were participating as “a gesture of the peace and humanity that we lost… there is no ‘we’ and ‘they’ in this whole thing – we are humanity and we all have one common enemy – the terrorists are our common enemy”.
Garissa Township MP Aden Duale was one of those taking part.
He told Kenya’s Daily Nation: “I would like to take this opportunity to thank all Kenyans for standing with Garissa at their hour of need, this clearly shows that we are united to defeat this menace by the name al-Shabab.”
The paper says security is tight in and around the college in Garissa, 365km (225 miles) north-east of the capital.
This is in stark contrast to the time of the attack, when only two guards were on duty, despite official warnings that an attack on an institution of higher learning was likely.
The four gunmen were killed during the siege but it took 16 hours for anti-terrorism forces to bring the attack to an end.
Garissa university campus
1. Militants enter the university grounds, two guards are shot dead
2. Shooting begins within the campus
3. Students attacked in their classrooms while preparing for exams
4. Gunmen believed isolated in the female dormitories
5. Some students make an escape through the fence