French cement group Lafarge destroyed computer hard drives and tried to hide elements from an investigation into the firm’s suspected payments to armed groups in Syria, human rights lawyers said on Tuesday.

They were speaking at a news conference on the course of French prosecutors’ preliminary inquiry into Lafarge’s operations launched in June on suspicion of “financing of a terrorist enterprise”.

The lawyers for rights group Sherpa accused Lafarge of not cooperating with authorities and trying to hide important elements from the investigation. They want the company to be placed under formal criminal investigation.

Sherpa claimed that Lafarge paid close to 13 million euros ($15.2 million) to armed groups including Islamic State militants to keep operating in Syria from 2011-2015.

A large part of the money went directly or indirectly into the pockets of Islamic State and payments lasted until well after the closure of Lafarge’s Jalabiya plant in September 2014, according to Sherpa.

Sharpa lawyers were citing a figure pinpointed by prosecutors examining Lafarge’s activities in Syria, in the throes of civil war since 2011, and drawn from an internal report by U.S. law firm Baker and McKenzie for Lafarge.

“As part of the inquiry, the precise figure retained is 12,946,000 euros paid by Lafarge between 2011 and 2015 to terrorist organisations, including the Islamic State,” Sherpa lawyer Marie Dose said.

Lafarge became LafargeHolcim, the world’s largest cement maker, in 2015 after a takeover by Swiss Holcim.

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Former LafargeHolcim CEO Eric Olsen resigned in April after the company admitted it had paid armed groups to keep a factory operating in Syria. His lawyer has said Olsen will appeal against being put under investigation.

Sherpa and other human rights groups in France as well as the French Finance Ministry have filed suit against Lafarge.

A LafargeHolcim spokeswoman on Tuesday rejected these accusations but would not comment on the 13-million-euro figure.

“LafargeHolcim fully cooperates with the justice (authorities). Thousands of documents have been given by the group to magistrates or seized during a search,” she said.

“We strongly contest that the company is trying in any way to limit the right of its employees or former employees to defend themselves…or (limit) their capacity to cooperate in a judicial inquiry,” she added.

Being placed under formal investigation in France means that prosecutors believe they have “serious or consistent evidence” that could result in prosecution. It is a step towards a possible trial, though the investigation can still be dropped.

Last Friday the Paris prosecutor also placed Olsen’s predecessor as CEO, Bruno Lafont, and his ex-deputy for operations under formal investigation as part of the inquiry into Lafarge activities in Syria, the two men’s lawyers said. (France24)