NAIROBI, Feb. 15 (Xinhua) -- Two Kenyan soldiers were shot dead and six seriously injured in an ambush by unknown gunmen at the Kenya-Sudan border on Sunday.

Kenya's Military Spokesman Bogita Ongeri confirmed the incident, saying the Kenyan team was on routine patrol early Sunday when they were ambushed. Six others were airlifted to Nairobi with serious injuries sustained during the attack.

"We are yet to know the attackers, but the soldiers were killed as they patrolled the border. Six are being airlifted to Nairobi," Ongeri was quoted as saying by to the Standard newspaper on Monday.

He said the two died on the spot when the gunmen opened fire at their vehicle. Ongeri said the victims were part of a patrol team deployed at the common border to ensure safety of Kenyans in the area.

However, the military spokesman could not confirm that the attackers, some in military fatigues, also took away all the guns belonging to the eight casualties.

Witnesses said the attackers made away with the officers' uniforms, but Ongeri said he was yet to get such a brief. The border has been in contention over a number of issues including the location of immigration offices.

The offices stood about a kilometer away from Sudan, but the Kenyan government decided to move it near the main border.

The latest incident between Nairobi and Juba comes months after Kenya warned southern Sudan of possible bumpy relations if the government does not prevent armed incursions into Kenyan territory by armed raiders.

Last year, two Kenyan ministers were separately harassed by Sudanese People's Liberation Army (SPLA) soldiers manning a roadblock well inside Kenya's territory.