Later in the day, it was reported analysis showed 95% methane. A camera, inserted into a safe haven in the mine, found no evidence of human activity. Rescue response In accordance with the protocols established in New Zealand's Co-ordinated Incident Management System, the emergency response was led by New Zealand Police – in this case Superintendent Gary Knowles, District Commander of the Tasman region. In addition to police, "Operation Pike" involved staff and management from Pike River Coal Ltd, the company operating the mine (represented at media and family conferences by CEO Peter Whittall), mine rescue experts from New Zealand and Australia, the Red Cross, ambulance services, the New Zealand Defence Force, and the Fire Service. The recovery phase was led by Inspector Mark Harrison, with Knowles in charge overall. A welfare centre was set up at the Red Cross Hall in Greymouth for the families of the missing men. Police encouraged families to use this centre rather than trying to reach the mine's access road, which was closed to everyone except emergency services. After several days of delays in entering the mine, some locals expressed anger at what they considered the undue cautiousness of the rescue teams, noting that in historical accidents the rescue efforts were undertaken by fellow miners. In response to the continued criticism from various media and local families for their refusal to send rescuers into the mine, Trevor Watts, leader of the Mines Rescue, explained the team's belief that any rescuers would have also been killed given the conditions within the mine. Their cautious approach was supported by many international mine rescue experts. Both the Australian and New Zealand stock exchanges placed trading halts on Pike River Coal (PRC) shares following the first explosion to allow the company time to "provide the market with a detailed update". PRC's largest shareholder New Zealand Oil & Gas, which owned 29.4%, was also placed on a trading halt for two days; upon reinstatement the shares lost 29% of their value. PRC's shares were halted for 13 days. On 2 December 2010, when New Zealand held a nationwide moment of silence, including at the stock exchange, PRC's suspension was inadvertently allowed to end and about 200,000 share trades were later invalidated. The first explosion was classified as a "highly, highly irregular event", and the New Zealand Prime Minister John Key immediately announced the government would hold an inquiry into