World powers said on Thursday that mooted upcoming talks with Iran focused on its nuclear programme must be “serious,” without pre-conditions and produce “concrete results.” “We call on Iran to enter, without pre-conditions, into a sustained process of serious dialogue, which will produce concrete results,” said a statement on behalf of the United States, China, Russia, France, Britain and Germany, known as the P5+1. They added that their readiness to negotiate was “on the understanding that these talks will address the international community’s long-standing concerns and that there will be serious discussions on concrete confidence building measures.” The statement was read out by China’s envoy to the UN atomic watchdog, the International Atomic Energy Agency (IAEA), at a closed-door regular board meeting at its Vienna headquarters. On Tuesday EU foreign policy representative Catherine Ashton said on behalf of the six powers that they were ready to hold talks with Iran. It remained to be agreed where and when the negotiations would be held. The last round, which took place in Istanbul, Turkey in January 2011, broke down, according to Western diplomats, over Tehran’s demand to discuss “preconditions” before honing in on the nuclear dispute. Ashton said in a letter to Iran’s chief nuclear negotiator Saeed Jalili that the powers did not want to “repeat the experience of Istanbul” and that the dialogue “will have to focus” on the “key issue” of Iran’s nuclear programme. Hamas stand Meanwhile, Gaza’s ruling Hamas has sent conflicting signals on whether it would stay on the sidelines if war breaks out between Israel and Iran. A Hamas spokesman said on Wednesday the group didn’t have enough firepower the enter a regional war, while a senior official later reportedly threatened “retaliation with utmost power.” Hamas spokesman Fawzi Barhoum said that the group has only “humble weapons that aim to defend and not to attack.” This limited arsenal “does not give us the ability to be part of any regional war,” he said. Salah Bardawil, a member of Hamas’ top decision-making body, the political bureau, reportedly adopted a similar view.