An unidentified suicide bomber blew himself up at a university, in a Houthi-controlled province in Yemen.
Suicide bomber entered the University of Ibb, wearing women's clothing, security forces said.
There were no reports of casualties.
Last week, at least 16 Yemeni soldiers were killed and six other soldiers wounded by a roadside bomb in the province of Marib, east of the capital Sanaa.
Meanwhile, the fighting in Yemen between Saudi-led Arab coalition and the Houthi militant groups backed by rebels loyal to former President Ali Abdullah Saleh, killed more than 50 people in the last two days.