The Globe and Mail reports in its Tuesday, June 28, edition that Alberta's Environment Department has fined Canadian Natural Resources $500,000 for incidents at its Horizon facility. A Canadian Press dispatch to The Globe reports that in a news release, the department says on May 28, 2010, the plant's sulphur recovery unit failed and poisonous hydrogen sulphide escaped at both ground level and through a flare stack. The company did not report the incident until June 3. In an unrelated incident on Aug. 2, 2012, the sulphur recovery unit again failed. Environment and Sustainable Resource Development (ESRD) began investigating after receiving reports of high air monitoring readings in the area and complaints from people in Fort MacKay. The company was charged for the leak, failing to report the incident and for providing misleading information to the government and the Fort MacKay First Nation. Each charge carried a possible fine of $500,000. The company was found guilty only of contravening the conditions of the plant's approval and was fined $150,000 after admitting to the incident. The rest of the charges were dismissed or withdrawn.