The four men told the inquiry they did not know why the plane failed to gain height after it took off.四名男子告诉调查组说他们不知道为什么飞机起飞后未能升高。The club is under investigation by the fraud squad.反诈骗调查组正在对该俱乐部进行调查。The arson squad is investigating the blaze.纵火案调查组正在调查这起火灾。Lord Justice Scott will head the inquiry.法官斯科特大人将担任这个调查组的负责人。