At least 40 people were killed in a suicide car bomb attack on an army training camp in Yemen's second city of Aden on Monday, security officials said in a new toll.

Medics from Al-Wali hospital in Aden said that dozens of those wounded in the morning attack who were hospitalised had succumbed to their wounds. 

A security official gave an initial figure of 11 dead in the car bombing, which struck a gathering of Yemeni army recruits at the camp.