An environmental advocacy group says in a report released Thursday that over 1.4 million rosewood logs from Nigeria worth $300 million were illegally sent to China after the then-Environment Minister Amina Mohammed signed thousands of retroactive permits.

The Washington-based Environmental Investigation Agency, known as EIA, said in the report that multiple sources told its undercover investigators that over $1 million was paid to top  government officials in Nigeria to release wood stopped by Chinese authorities because there were no CITES certificates.

CITES Thursday released a 40-page report alleging that Mohammed’s approval of the kosso exports violated the CITES agreement.

According to report in the United States Thursday Amina Mohammed who is now  the U.N. deputy secretary-general, spent her final days as Nigeria’s environment minister doing something that has outraged activists. Despite a ban then in force on the export of rosewood, an endangered resource, she signed thousands of certificates authorizing the shipment of vast quantities of the wood.

The certificates “came in bags, and I just signed them because that is what I had to do,” she recalled in an interview last month in her sprawling 38th-floor U.N. headquarters office “I don’t remember how many, she admitted.

EIA said rosewood is coveted in China for furniture and over the past five years “exploding Chinese demand” has depleted forests across West Africa. As supplies in Gambia and Benin dwindled, it said Chinese traders moved to Nigeria, which had the largest untapped resource.

Since 2013, the advocacy group said, Nigeria has been transformed from a net importer to the world’s largest exporter of rosewood logs, which is causing desertification, threatening national parks and imperiling the livelihoods of millions of people.

Mohammed’s 11th-hour decision to approve the kosso shipments was first documented by a Washington-based environmental group and is now part of an inquiry by the secretariat of the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES), to which Nigeria is a signatory.

In a letter to Nigerian authorities in August 2017, John Scanlon, CITES’s secretary-general, raised concern about information his agency had received indicating that as many as 10,000 containers of Nigerian rosewood had been stopped by Chinese authorities between May and December 2016, because they were not accompanied by the proper CITES documentation, according to Michael Osakuade, the acting director of Nigeria’s Department of Forestry. On Dec. 31, 2016, Mohammed herself imposed a three-month ban on the trade in rosewood. Yet following Mohammed’s mass signings, more than two weeks after the ban went into force, the trade quickly resumed: Chinese trade data show that between then and April, as many as 12,000 containers of kosso logs were cleared to enter the country.