More than 70 people were killed in the attack on Garissa University College in Kenya, the country’s interior ministry says.
Two of the gunmen have been killed, the country’s interior ministry said.
About 500 out of 815 students have been accounted for, the country’s interior ministry added.
In a statement on Twitter, the ministry said: “Two terrorists have been neutralised in the ongoing operation. Security agencies intensify rescue operation.”
Interior minister Joseph Nkaissery said that most students at Garissa University College that was attacked by al-Shabab gunmen remain unaccounted for, more than 11 hours after the attack started.
Mr Nkaissery said: “Garissa University college has a student population of 815 and about 60 members of teaching staff, as of now we are able to account for 292 students and all the staff.”
The known death toll from the attack by the Islamic extremists is now 17, with the deaths of two of the attackers.
An unknown number of hostages are being held. Many students scattered when the attack began at 5.30am local time.
A spokesperson for Sans Frontières/Doctors Without Borders (MSF) said a medical team is assessing the situation at Garissa Hospital and will provide support should there be an influx of wounded.
“The team consists of one doctor, three nurses, three clinical officers, one anaesthetist and one logistician.”
“They have equipment to provide surgical support and medical care for 150 wounded. MSF also has the capacity to provide medical evacuations by air to Nairobi if necessary,” the spokesperson added.