Violence strikes Yemen's capitol city, Sanaa, with some 30 killed in a car bomb attack at a police academy.

In the aftermath, blood-filled streets with no one claiming responsibility for the attack.

(SOUNDBITE) (Arabic) WITNESS, ABDULKARIM RAZHI, SAYING:

"We heard a violent explosion. When we came to the scene of the explosion, the explosion was a car bomb which targeted the police college. At the time of the explosion, there were students coming out of the college. Most of the victims are students."

Police say more than 50 were wounded in the blast.

The victims included students at the college and people waiting in line to enroll with the police, as well as passers by.

Turmoil in Yemen has accelerated since September when the Shi'ite Muslim Houthi militia seized Sanaa, prompting fears of sectarian conflict.