50 killed in bombing at police college

A car bomb exploded outside a police college in Sanaa, Yemen's capital, on Wednesday, killing more than 50 people and wounding 20, security officials and medics said, underscoring the country's deteriorating security and a persistent al-Qaida threat.

Sectarian conflict that led to a change of government and splits in the army has worsened since September, when the Shiite Muslim Houthi militia seized Sanaa.

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