The death toll in a suicide bombing in Yemen's capital Sanaa has doubled with at least 30 people dead.
Security officials say Wednesday's blast happened near Sanaa's police academy as the cadets gathered.
They say the suicide bomber drove a minibus and his attack wounded at least 40 people.
At the scene of the blast, the dead and wounded lay on a footpath against a wall.
"What happened is we were all gathering and ... (the bomber) exploded right next to all of the police college classmates," eyewitness Jamil al-Khaleedi told The Associated Press. "It went off among all of them, and they flew through the air."
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No one immediately claimed responsibility for the attack.
Yemen's local al-Qaeda branch, targeted in frequent US drone strikes in the country, has carried out similar attacks in the past.
The blast comes as Shi'ite rebels known as Houthis seized large areas of Yemen, including Sanaa, as part of a protracted power struggle with President Abed Rabbo Mansour Hadi.
An al-Qaeda suicide bomber killed at least 24 people on December 31 in an attack on Houthis as they commemorated the birth of the Prophet Mohammed.
