CARACAS, Venezuela (AP) — Venezuela’s oil czar announced his resignation Monday as officials investigate alleged corruption among public officials in the state oil industry and other parts of the government.

Tareck El Aissami announced his resignation on Twitter and pledged to help the investigation into any allegations involving Petroleos de Venezuela SA, commonly known as PDVSA, while also offering support to President Nicolás Maduro’s anti-corruption campaign.

“… I place myself at the disposal of the leadership of the (ruling party) to support this crusade that the President @NicolasMaduro has undertaken against the anti-values that we are obliged to fight, even with our lives,” El Aissami wrote.

Venezuela’s National Anti-Corruption Police last week announced an investigation into unidentified public officials in the oil industry, the justice system and some municipalities, though they did not cite PDVSA.

Corruption has long been rampant in Venezuela, which sits atop the world’s largest petroleum reserves. But officials are rarely held accountable — a major irritant to citizens, the majority of whom live on $1.90 a day, the international benchmark of extreme poverty.

Maduro acknowledged El Aissami’s decision in televised remarks during a gathering of governing party leaders. He said he accepted the resignation “to facilitate all the investigations that should result in the establishment of the truth, the punishment of the culprits, and justice in all these cases.”

The US government designated El Aissami, a powerful Maduro ally, a narcotics kingpin in 2017 in connection with activities in his previous positions as interior minister and governor. The Treasury Department alleged “he oversaw or partially owned narcotics shipments of over 1,000 kilograms from Venezuela on multiple occasions, including those with the final destinations of Mexico and the United States.”

Under the government of the late President Hugo Chávez, El Aissami headed the Ministry of Internal Affairs. He was appointed minister of oil on April 2020.

Attorney General Tarek William Saab in a radio interview Monday said that at least a half dozen officials, including people affiliated with PDVSA, had been arrested, and he expected more to be detained.

“I assure you, even more so at this moment, when the country calls not only for justice but also for the strengthening of the institutions, we will apply the full weight of the law against these individuals,” Saab said.

Oil is Venezuela’s most important industry. A windfall of hundreds of billions in oil dollars thanks to record-high global prices allowed Chávez to launch numerous initiatives, including state-run food markets, new public housing, free health clinics and education programmes.