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A car bomb exploded outside a police college in Yemen's capital Sanaa on Wednesday, killing about 30 people and wounding more than 50, police sources said, underscoring the country's deteriorating security and a persistent al Qaeda threat, Reuters reported.

Sectarian conflict after a 2011 popular uprising that led to a change of government and splits in the army has worsened since September when the Shi'ite Muslim Houthi militia seized Sanaa.

Al Qaeda in the Arabian Peninsula (AQAP), one of the Sunni militant group's most active wings, had staged increasing numbers of attacks across Yemen before the Houthi advance and has carried out more bombings and shootings since.

There was no immediate claim of responsibility for Wednesday's bombing. Al Qaeda has in the past claimed they were behind similar attacks.

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

The explosion was heard across the city and a large plume of smoke was visible near the college in a heavily congested part of the city near the central bank and the defense ministry.