One Ugandan soldier was killed and another one injured after unknown gunmen attacked their boat patrolling Lake Edward which straddles its border with the Democratic Republic of Congo, army spokesman Brig Richard Kalemire has told the BBC.

He denied reports, which we carried earlier, that four UPDF soldiers and three civilians had been killed after clashing with DR Congo navy after Ugandan soldiers chased after Congolese fishermen.

"This was an unprovoked attack", he said on the phone from Kampala.

Brig Kalemire said the two soldiers were conducting a normal operation patrolling near the lake-side Ugandan village of Rwensha.

Donat Kibwana, the administrator of the Beni region in DR Congo eastern province of Nord-Kivu, told news agency AFP that the Uganda boat was operating in Congolese waters.