Only a ceasefire deal in Gaza stemming from hoped-for talks this week would hold Iran back from direct retaliation against Israel for the assassination of Hamas leader Ismail Haniyeh on its soil, three senior Iranian officials said according to Reuters.

One of the sources, a senior Iranian security official, said Iran, along with allies such as Hezbollah, would launch a direct attack if the Gaza talks fail or it perceives Israel is dragging out negotiations. The sources did not say how long Iran would allow for talks to progress before responding.

Iran, two of the sources said, was considering sending a representative to the Gaza ceasefire talks, due to begin this week in either Egypt or Qatar, in what would be a first since the bombardment started in Gaza.

The representative would not directly attend the meetings but would engage in behind-the-scenes discussions “to maintain a line of diplomatic communication” with the United States while negotiations proceed.

Two senior sources close to Lebanon’s Hezbollah said Tehran would give the negotiations a chance but would not give up its intentions to retaliate. A ceasefire in Gaza would give Iran cover for a smaller “symbolic” response, one of the sources said.