In a statement sent via e-mail on Tuesday, the KLA said that it had regrouped to "avenge the death of the two protesters" killed in the recent demonstrations in Pristina organised by the movement Self-Determination, and that Monday's attack had not been intended to cause any casualties.
The now disbanded guerrilla group fought for Kosovo's independence from Serbia during the 1998-1999 conflict.
There were no casualties in the bomb attack in downtown Pristina, in which three vehicles were damaged, but the incident has increased tension as talks on Kosovo's future are approaching.
The attack has contributed to the atmosphere of insecurity in Kosovo, with the Self-Determination movement saying that today it would announce the dates of new demonstrations against the UN plan which it believes does not go far enough in giving Kosovo independence, offering internationally supervised statehood to the Serbian province.