From the Jerusalem Post:

Last week’s failed attempt on the lives of Israeli diplomats in Jordan was apparently carried out on instructions from Teheran, sources close to Jordan’s General Intelligence Department (GID) revealed on Monday. The sources said the GID was investigating the possibility that the explosives used in the attack had been smuggled into the kingdom by Iranian diplomats. The attack itself was apparently carried out by local al-Qaida supporters who received money and explosives from Iran, the sources said.