<ul data-eligibleForWebStory="true">The United States' National Transportation Safety Board (NTSB) has launched a parallel probe into the Air India plane crash in India.The crash involved a London-bound Boeing 787-8 (AI 171) that killed 241 people on board and 29 people on the ground.The US NTSB, as the aircraft is American-made, is conducting an investigation under international protocols.Several international experts have been inspecting the crash site for clues, including teams from Boeing and Air India.The cockpit voice recorder has been found, aiding investigators in determining the cause of the crash.Assistance in the probe is being provided by officials from the Airports Authority of India and Gujarat police.