A U.N. office says it is rejecting a $15 million offer from a foundation now under scrutiny after its leader was arrested and accused in an alleged bribery scheme.

The director of the U.N. Office for South-South Cooperation told The Association Press in an interview Friday that his office was "not pursuing" the offer made by the Sun Kian Ip Group Foundation earlier this year.

The foundation's leader, Macau billionaire Ng Lap Seng, is accused of lying about plans for $4.5 million in cash brought into the U.S. over several years aboard private jets.

The U.N. official, Jorge Chediek, says his office is conducting an internal review of "all details of relationships" with the foundation and with the Global Sustainability Foundation, whose leader is also accused in the alleged scheme.