Doha, June 07 (QNA) - Qatar Petroleum (QP) Thursday announced the official prices of its onshore and offshore crude oil for the month of May, 2012.  QP set the onshore crude oil price at US Dlrs. 109.45 per barrel and the offshore crude oil price at US Dlrs. 108.50 per barrel, the company said in a statement issued here on today.(QNA)