Gunmen from the militant Islamist group al-Shabab have killed at least 15 people and taken students hostage at a university in north-eastern Kenya.
Reports say 65 others were wounded when gunmen stormed a university in Garissa.
Witnesses said masked attackers fired indiscriminately and there are fears there could be more casualties.
Al-Shabab, which is linked to al-Qaeda, said it was holding Christians hostage and freeing Muslims.
Hostages from the two groups had been separated, and 15 of the Muslims had already been released, a spokesman for the group told the BBC.
In previous attacks in north-eastern Kenya, al-Shabab spared the lives of Muslims while killing non-Muslims.