Israel has conducted several strikes on Iranian-controlled bases in Syria and Iraq in recent weeks with permission from the United States and Russia, a Western diplomatic source told a Saudi-owned newspaper Wednesday.

Moscow and Washington agreed that the Jewish state could conduct these attacks on Iranian targets in order to “ensure Israel’s security,” the source told the London-based Arabic-language Asharq Al-Awsat.

In recent weeks, a number of explosions have been reported in Iraqi military installations connected to pro-Iranian Shiite militias, including on Tuesday night in an arms depot north of Baghdad.

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As part of the reported agreement, Israel would not publicly acknowledge carrying out the strikes. However, this has not prevented Israeli officials from hinting at their involvement in these attacks.

Asked about Tuesday night’s blast at the pro-Iranian militia base, Prime Minister Benjamin Netanyahu told Israeli reporters, “Iran has no immunity, anywhere… We will act — and currently are acting — against them, wherever it is necessary.”

The explosions have occurred in bases and warehouses belonging to militia groups under the umbrella of the mainly Iran-backed Popular Mobilization Forces (PMF). The state-sanctioned PMF militias have fought alongside Iraq’s regular armed forces against the Islamic State group.

Iraqi MP Karim Alaiwi told pro-Hezbollah Lebanese network al-Mayadeen on Wednesday that evidence pointed to Israel being behind recent attacks on Shiite militias, adding that the Jewish state was trying to weaken the PMF.

Alaiwi said American forces controlled Iraqi airspace and reasoned that no one could be conducting airstrikes without US knowledge.

The Iraqi Civil Defense said in a statement that Tuesday’s blast occurred near Balad air base, one of the country’s largest. A Shiite militia group is stationed nearby.

The officials who confirmed the explosion spoke to The Associated Press on condition of anonymity in line with regulations. They said the blast occurred in a depot belonging to the PMF and that an investigation was underway.

The mysterious blasts have given rise to a host of theories, including that Israel may have conducted airstrikes.

No one has claimed responsibility for Tuesday’s blast or other recent explosions.

In July, an explosion took place at a PMF base in Amirli, in Iraq’s northern Salaheddin province, killing two Iranians and causing a huge fire.

Last week, a massive explosion was also reported at the al-Saqr military base.

Israel has struck Iranian bases in neighboring Syria on numerous occasions, and there has been speculation that it might be expanding its campaign to target Iranian bases in Iraq. However, neither the Iraqi government nor Israel has addressed the reports.

Israeli officials have identified Iraq as a likely growing base of operations for Iran-backed efforts against the Jewish state. But Israeli officials have so far neither confirmed nor denied responsibility for the strikes.

Raphael Ahren, AP and Times of Israel staff contributed to this report.