Updated

SAN'A, Yemen -- Yemeni officials say gunmen from a southern separatist movement ambushed a military convoy, killing two officers a day after a brazen assault on the southern intelligence headquarters.

The early Sunday ambush in the southern Dali province is the latest salvo in increasingly violent standoff between the government and a southern separatist movement.

The ambush is most likely unrelated to the attack by four gunmen on the Aden intelligence headquarters Saturday, which the government said was carried out by al-Qaida.

North and south Yemen were separate countries for decades and only united in 1990. Many southerners accuse the north of monopolizing power and discriminating against the south.

Officials said a number of the attackers also died in the ambush.