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. Troops are engaging the gunmen.
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.
About five masked gunmen are said to have stormed the university.
Kenya’s Interior Minister Joseph Nkaissery told journalists that one of the militants had been killed as he tried to flee.
Out of 815 students, 535 had not yet been accounted for, he said.
A policeman at the scene told Reuters news agency that some students had been taken hostage.
“We can’t tell how many but they are many since the college was in session,” the unnamed policeman is quoted as saying.
The Kenyan Red Cross said about 50 students had been “safely freed”, but an unknown number were still being held, AFP news agency reports.