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The militant Islamic State (IS) group said on Thursday that it carried out twin bombings<\/a> which killed at least 84 people at a memorial ceremony in Iran for slain Revolutionary Guards general Qasem Soleimani.<\/p>\n The claim from IS came as Iran observed a day of national mourning for those killed in Wednesday\u2019s blasts.<\/p>\n In a statement on Telegram, IS said two of its members \u201cactivated their explosives vests\u201d among the crowds who had come to honour Soleimani on the anniversary of his death<\/a> in a targeted US drone strike in Baghdad four years ago.<\/p>\n Iranian investigators had already confirmed that the first blast at least was the work of a \u201csuicide bomber\u201d and believed the trigger for the second was \u201cvery probably another suicide bomber\u201d, the official IRNA<\/em> news agency reported earlier, citing an \u201cinformed source\u201d.<\/p>\n Soleimani, who headed the Guards\u2019 foreign operations arm the Quds Force, was a staunch enemy of IS, an extremist group which has carried out previous attacks in Iran.<\/p>\n The death toll was revised down from around 100 the day after what Iranian authorities labelled a \u201cterrorist attack\u201d that also wounded hundreds near Soleimani\u2019s tomb in the southern city of Kerman.<\/p>\n Iran has suffered deadly attacks in the past from militants as well as targeted killings of officials and nuclear scientists blamed on arch-foe Israel.<\/p>\n Interior Minister Ahmad Vahidi spoke to the ISNA<\/em> news agency about bolstering security over its porous borders with Afghanistan and Pakistan.<\/p>\n He said authorities have identified \u201cpriority points to block along the border\u201d with the two countries, which has long been a key access point for militant groups, drug smugglers and irregular migrants.<\/p>\n