It's time for the United States to hold Iran accountable.

The United Nations chief expressed concern to the Security Council that Iran may have violated an arms embargo by supplying weapons and missiles to Lebanese Shi'ite group Hezbollah, according to a confidential report, seen by Reuters on Sunday.

The second bi-annual report, due to be discussed by the 15-member council on Jan. 18, also cites an accusation by France that an arms shipment seized in the northern Indian Ocean in March was from Iran and likely bound for Somalia or Yemen.

Most UN sanctions were lifted a year ago under a deal Iran made with Britain, France, Germany, China, Russia, the United States and the European Union to curb its nuclear program. But Iran is still subject to an arms embargo and other restrictions, which are not technically part of the nuclear agreement.

The report was submitted to the Security Council on Dec. 30 by UN Secretary-General Ban Ki-moon before he was succeeded by Antonio Guterres on Jan. 1. It comes just weeks before US President-elect Donald Trump, who has threatened to either scrap the nuclear agreement or seek a better deal, takes office.

"In a televised speech broadcast by Al Manar TV on 24 June 2016, Hassan Nasrallah, the Secretary-General of Hezbollah, stated that the budget of Hezbollah, its salaries, expenses, weapons and missiles all came from the Islamic Republic of Iran," Ban wrote in the report.

"I am very concerned by this statement, which suggests that transfers of arms and related materiel from the Islamic Republic of Iran to Hezbollah may have been undertaken contrary (to a Security Council resolution)," Ban said.

When asked by the United Nations to clarify the issue, Iran's mission to the United Nations said "measures undertaken by the Islamic Republic of Iran in combating terrorism and violent extremism in the region have been consistent with its national security interests and international commitments."

Under a Security Council resolution enshrining the deal, which came into effect a year ago, the UN secretary-general is required to report every six months to the council on any violations of sanctions still in place.

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