A series of attacks at Yemen's defence ministry have left at least 20 people dead and 37 injured, officials say, according to BBC News.

A suicide car bomb blew up at the gates of the complex in Sanaa's Bab al-Yaman district, at the entrance to the old city, and a gunbattle followed with suspected militants inside. Officials said the situation was under control and most of the gunmen dead.

Yemeni security forces are fighting regional rebels and al-Qaeda, while combating lawlessness and army splits.

No group has said it carried out Thursday's attack. Correspondents say it bears the hallmarks of al-Qaeda in the Arabian Peninsula (AQAP).

However, one government minister has blamed people linked to former President Ali Abdullah Saleh.

"The attack took place shortly after working hours started at the ministry when a suicide bomber drove a car into the gate," a ministry source said, quoted by Reuters. The blast was heard hundreds of metres away.

"The explosion was very violent, the whole place shook because of it and plumes of smoke rose from the building," an eyewitness told the agency.