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Since its early days, the investigation into the explosion has faced a slew of political and legal challenges.

In December 2020, lead investigator Fadi Sawan charged former Prime Minister Hassan Diab and three ex-ministers with negligence.

But as political pressure mounted, Sawan was removed from the case.

His successor, Tarek Bitar, unsuccessfully asked lawmakers to lift parliamentary immunity for MPs who were formerly cabinet ministers.

The interior ministry has refused to execute arrest warrants that the lead investigator has issued.

In December 2021, Bitar suspended his probe after a barrage of lawsuits, mainly from politicians he summoned on charges of negligence.

Bitar has refused to step aside but has not set foot inside Beirut’s Justice Palace for months.

“Work [on the investigation] is ongoing,” a legal expert with knowledge of the case said, requesting anonymity because of the sensitivity of the issue.

Bitar is determined to keep his promise to deliver justice for victims’ families, the expert added.

On Thursday, 300 individuals and organisations, including Human Rights Watch (HRW) and Amnesty International, renewed a call for the United Nations to establish a fact-finding mission – a demand Lebanese officials have repeatedly rejected.

“If those responsible are not held accountable, it will put the country on a trajectory that allows this kind of crime to be repeated,” HRW’s Lama Fakih told the Agence France-Presse news agency at the protest.