Guwahati/Dibrugarh, Jan. 21: The Ulfa today claimed to have killed 15 soldiers and injured several others in a pre-dawn attack on a camp housing a platoon of 6 Jat regiment in Daisajan tea estate under Doomdooma police station in Tinsukia district. A person, claiming to be Ulfa chief Paresh Barua, called up The Telegraph and claimed that a group of 30 armed cadre of the outfit attacked the army platoon. Though army officials based in Laipuli in Tinsukia district admitted that the attack took place, they said that there were no casualties.