 On 11 August 2008, several protesters from Oxford and Thames Valley Climate Action glued their hands to the doors of BHP Billiton's headquarters in protest of the use of coal as a fuel.BHP Billiton is the world's largest coal producer.1,500 officers were involved at an estimated cost of £5.9m, there were over 100 arrests and some 2000 'potentially harmful' items were confiscated At the time ministers at the time claimed that 70 officers had been injured in the course of their duties, though a Freedom of Information request later showed these included sunburn and wasp stings, and none were caused by protesters.