Iraqs government is preparing a complaint to the UN after finding Israel is "certainly" behind several attacks on Popular Mobilization Forces bases, a parliamentarian and leading member of the force said. The PMF network of paramilitary groups has blamed both Israel and the US for a string of blasts and drone sightings at its bases in recent weeks. Baghdad has thus far refrained from making accusations but said it was studying "indications of foreign involvement". Ahmad al-Assadi, a PMF official and spokesman for its parliamentary bloc "Fatah", told journalists on Thursday in his Baghdad office that government probes would name Israel. "Some of the government investigations have reached a conclusion that the perpetrator behind some of the attacks is absolutely, certainly Israel," he said, declining to provide details on the evidence, reported AFP. "The government is preparing sufficient evidence and documents to complain to the (UN) Security Council. It wont submit a complaint against an unknown entity." Since mid-July, five PMF arms depots and camps have been targeted in apparent attacks and the group said it had fired at surveillance drones over two other bases. PMF top officials have said the US is broadly "responsible" but specifically blamed Israeli drones for the latest strike on Sunday, which killed a Hashed fighter near Iraqs western border with Syria. The Pentagon has denied responsibility and said it is cooperating with Iraqs investigations, but Israel has neither confirmed nor denied involvement. Assadi told reporters the US role remained unclear, dulling the groups earlier accusations. "Israeli planes supported by the US? We cant make that accusation. Did America give a green light? We cant make that accusation," he said. But, Assadi added, the PMF had been expecting an attack as US-Iranian tensions rose after Washington withdrew from a landmark nuclear deal with Tehran last year. The US has since imposed tough sanctions on Iran as well as several Hashed leaders and factions. "Are the attacks that happened surprising for the Iraqi government, the PMF, or other factions? Of course not," Assadi said. "Its clear. The PMF is being specifically targeted." He did provide some details on the government probe into the August 13 blasts at the Saqr military base near Baghdad, where PMF fighters are based, and which Assadi said involved three drones. "The first drone surveilled, the second attacked and the third took pictures of the base after the strike," he said. Losses for a single brigade there were estimated at a billion Iraqi dinars, or more than $800,000, the lawmaker added. He denied allegations that long-range Iranian missiles were stored at the attacked sites and evaded an AFP question on the groups role in transferring weapons to neighboring Syria. Assadi, formerly the PMF’s spokesman and still a leader within the group, attended a meeting earlier this week between its top brass and Iraqs president, premier and parliament speaker. "We said in the meeting that the resistance factions are ready to respond now if the government wanted that. If you want a response in Iraq, against Israel, in any area," said Assadi. But he stressed the PMF would abide by the governments policy of prioritizing diplomacy. "The PMF will not fire a single bullet or give a statement or issue a position if its not coordinated with the government," Assadi added.