BAGHDAD — A mock funeral procession marked the anniversary of the assassination of Iran’s top general and a senior Iraqi militia leader in a U.S. drone strike that heightened fears of a military escalation in the region.

Thousands of mourners joined the march on the highway leading to the Baghdad airport Saturday evening where the strike that killed Gen. Qassem Soleimani and senior Iraqi militia leader Abu Mahdi al-Muhandis took place. Soleimani's killing dramatically ratcheted up tensions in the region and brought the U.S. and Iran to the brink of war.

Posters of the dead men adorned both sides of the road, which was lined with tents that served food and drinks for those who walked the highway. The scene of the bombing was turned into a shrine-like area sealed off by red ropes, with a photo of Soleimani and al-Muhandis in the middle, as mourners lit candles.

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Popular Mobilization Forces and their supporters light candles at Baghdad's international airport on Saturday, Jan. 2, 2021, on the anniversary of the killing of Abu Mahdi al-Muhandis, deputy commander of the PMF and Gen. Qassem Soleimani, head of Iran's Quds forces. (Associated Press)

Shrapnel marks were still visible on the asphalt and walls in the area.

Soleimani headed Iran’s Revolutionary Guard’s elite Quds Force, responsible for the Islamic Republic’s foreign operations and frequently shuttled between Iraq, Lebanon and Syria.

The procession came as Iraq's military said that explosives experts with its naval forces successfully dismantled a mine that was discovered stuck to an oil tanker in the Persian Gulf two days earlier.

The statement Saturday said Iraqi authorities have opened an investigation into the incident. No group has claimed responsibility for placing the mine.

The announcement came a day after Iraq confirmed reports by private security firms that a mine had been discovered attached to the side of a tanker rented from Iraq's Oil Marketing Company, known as SOMO, as it was refueling another vessel. It said that Iraqi teams were working to dismantle the mine.

Popular Mobilization Forces and their supporters chant slogans against the United States at Baghdad's international airport on Saturday, Jan. 2, 2021, on the anniversary of the killing of Abu Mahdi al-Muhandis, deputy commander of the PMF and Gen. Qassem Soleimani, head of Iran's Quds forces in a U.S. airstrike. (Associated Press)

Iraq has not provided further details, but the two private security firms said the discovery was likely a limpet mine on the MT Pola, a Liberian-flagged tanker.

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A limpet mine is a type of naval mine that attaches to the side of a ship, usually by a diver-member of special forces. It later explodes, and can significantly damage a vessel.

A man grieves at the site of last year's U.S. airstrike at Baghdad's international airport on Saturday, Jan. 2, 2021, on the anniversary of the killing of Abu Mahdi al-Muhandis, deputy commander of the Popular Mobilization Forces and Gen. Qassem Soleimani, head of Iran's Quds force killing. (Associated Press)

The discovery came amid heightened tensions between Iran and the U.S. in the final days of President Donald Trump’s administration.

Already, America has conducted B-52 bomber flyovers and sent a nuclear submarine into the Persian Gulf over what Trump officials describe as the possibility of an Iranian attack on the anniversary of the strike near Baghdad that killed Soleimani and al-Muhandis.