At least 30 people have been killed by a suicide bomber who detonated a minibus packed with explosives outside a police college in Yemen, say officials.
Dozens were also wounded in the blast, which was heard across the capital Sanaa and sent a large plume of smoke into the sky.
The explosion happened as cadets gathered outside the police college.
At the scene, dead and wounded lay on the pavement, as ambulances ferried casualties away.
Eyewitness Jamil al-Khaleedi said: “What happened is we were all gathering and …(the bomber) exploded right next to all of the police college classmates.
“It went off among all of them, and they flew through the air.”
No one immediately claimed responsibility for the attack.
Yemen’s al Qaeda branch, targeted in frequent US drone strikes in the country, has carried out similar attacks in the past.
Security in Yemen has declined since a 2011 uprising, which led to a change in government and dissension within the army.