Lebanon’s caretaker PM Hassan Diab and three former ministers have been charged over the devastating Beirut explosion

Lebanon's caretaker prime minister, Hassan Diab, and three former ministers have been charged over the massive port explosion in Beirut in August, the country's official news agency has said.

Rubble, spilled grains remain around towering silos gutted in the massive August explosion at the Beirut port that claimed the lives of more than 200 people, in Beirut, Lebanon (AP Photo/Hussein Malla).

Judge Fadi Sawwan filed the charges against Hassan Diab and former finance minister Ali Hassan Khalil, as well as Ghazi Zeiter and Youssef Fenianos, both former ministers of public works.

All four were charged with negligence leading to deaths over the August 4 explosion at Beirut port, which killed more than 200 people and injured thousands.

The explosion was caused by the ignition of a large stockpile of explosive material that had been stored at the port for years, which top security officials and politicians had known about and did nothing about it.

A slogan is painted on a barrier in front of towering grain silos gutted in the massive August explosion at the Beirut port (AP Photo/Hussein Malla).

The blast is considered to be among the largest non-nuclear explosions ever to be recorded.

The four are the most senior individuals to be indicted so far in the investigation, which is being conducted in secrecy. Anger has been building up over the slow investigation process, lack of answers and the fact that no senior officials have been indicted.

About 30 other security officials and port and customs officials have been detained in the probe.

Diab, a former university professor, resigned a few days after the blast, which levelled the port and destroyed large parts of the city.

Zeitar was transport and public works minister in 2014, followed by Fenianos in 2016, who held the job until the beginning of 2020. Khalil was finance minister in 2014, 2016 and until 2020.

Documents surfaced soon after the explosion showing that at least 10 times over the past six years, authorities from Lebanon's customs, military, security agencies and judiciary raised the alarm that a massive stockpile of potentially dangerous chemicals was being kept with almost no safeguard at the port in the heart of Beirut.

President Michel Aoun, in office since 2016, said he was first told of the stockpile nearly three weeks before the explosion and immediately ordered military and security agencies to do "what was needed". But he suggested his responsibility ended there, saying he had no authority over the port and that previous governments had been told of its presence.

Since the material arrived in Lebanon in late 2013, four prime ministers have been in office during the past seven years.

Najib Mikati, Tammam Salam and Saad Hariri have reportedly said that they were not aware of the existence of the material at the port. Diab has said he was only informed about the presence of the "explosives" days earlier and planned to visit the site. He told reporters earlier this year that he cancelled his visit to the port after he was told that the material were fertilisers.

Investigators probing the blast had so far focused on personnel at the Port of Beirut. Judge Sawwan said he has set next Monday, Tuesday and Wednesday as dates for interrogating the four as defendants.

Both Khalil and Fenanios were sanctioned by the US in September this year, the first two officials to be subjected to those outside of Hezbollah group.

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