At least 103 people were killed on Wednesday when multiple explosions ripped through an area where a ceremony was being held to commemorate a top Iranian general who was assassinated four years ago by the US, said Sayyed Mohammad Saberi, head of the city’s Emergency Organization, Anadolu Agency reports.

The explosions took place on a route leading to the cemetery in the southeastern city of Kerman where Qassem Soleimani, the former head of the Islamic Revolutionary Guard Corps’ Quds Force, was laid to rest, according to state media.

The cause of the explosions remains unknown. Some media reports suggested that they were caused by gas canisters.

Iran’s National Medical Services Organization had earlier put the death toll at 73 and 170 others were injured.

The incident happened as tens of thousands of people converged in Soleimani’s hometown Kerman to commemorate the fourth anniversary of his assassination.

Soleimani was killed on Jan 3, 2020, in a US drone strike outside Baghdad Airport in Iraq.

Iran’s emergency services put all hospitals and health care centers on alert to attend to the injured.

Officials in Tehran have not commented on the incident yet.

According to Anadolu sources, the venue of the ceremony in Kerman has been vacated by security forces and people have been asked to return home.