Police found two pistols and ammunitions at the site of the blast that shattered the office building in Sofia's Lozenets district on Monday, Nikolay Nikolov, spokesman of the Sofia Directorate of the Interior, announced on Tuesday.
A revolver - Smith & Wesson, a gun with 25 bullets, a driving license and identity papers of the people killed in the blast were found at the shaft of the elevator.
The results of the autopsy of the bodies of the four killed in the blast and the other expert studies are expected to be announced in two or three days.
Stoil Slavov, who was killed together with his bodyguards, while in the elevator, has been tipped as the probable target of the blast.