London, May 1 : George Clooney has ended his role as a United Nations ' Messenger of Peace' after six years.

During his tenure, the 52-year-old American actor had helped raise awareness of conflicts in Democratic Republic of Congo and has campaigned about the Darfur crisis and violence in South Sudan, which gained independence in 2011, the BBC reported.

However, UN spokesman Stephane Dujarric said the 'Gravity' star "feels it is time to retire his official role".

Other UN 'Messengers of Peace' include actors Michael Douglas and Charlize Theron, musicians Lang Lang and Stevie Wonder, and author Paulo Coelho. (ANI)