A Hamas spokesman condemned the attack and pledged authorities "will track down the perpetrators".
A Hamas spokesman said the group's initial inquiry had found that Israel was behind the slaying.
Despite their boycott call, Hamas spokesmen made it clear on Sunday that they would work with an elected president.
Some two hours after the attack, a Hamas spokesman said that the attack is "a natural response to Israeli aggression."
A Hamas spokesman said later that night that a deal was close.
A Hamas spokesman calls the attack an "act of self-defense."
One of the suicide bombings was claimed by a Hamas spokesman in Damascus.
Why did the Hamas spokesman say what he said?
Hamas spokesmen have said the group views the truce as a failure and intends to continue carrying out attacks.
A Hamas spokesman in Lebanon also commented about the reported closing.