Sir, We would like to express our deep concern regarding the relationship between UBS and PetroChina (report, Oct 20 ). Darfur has recently been described by the UN as the worst humanitarian disaster in the world. The heavily indebted Government of Sudan relies upon oil revenues to continue supporting its campaign of murder, rape, displacement and atrocities.

UBS will be the lead underwriter for PetroChina’s debut on the Shanghai stock exchange. PetroChina is the listed arm of China National Petroleum Corporation, the largest and most problematic player in Sudan’s oil industry.

We call upon UBS to aggressively engage with PetroChina/CNPC requesting that the company either halt its operations in Sudan or implement a rigorous corporate governance policy that would mitigate the impact of its operations on innocent civilians. Should UBS find PetroChina/CNPC unresponsive, they should withdraw from the public offering.

Elie Wiesel

Nobel Peace Prize 1986

Jody Williams

Nobel Peace Prize 1997 & former head of UN Human Rights Council Mission on Darfur

Betty Williams

Nobel Prize 1977

Mia Farrow

Actress and Darfur campaigner

Justice Richard Goldstone

A former chief prosecutor, International Criminal Tribunals for Yugoslavia and Rwanda

Mukesh Kapila

A former UN Humanitarian Co-ordinator for Sudan 2003-2004

Ruth Messinger

President, American Jewish World Service

Christoph Wiedmer

Director, Society for Threatened Peoples, Switzerland

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