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An investigation into the pilots of missing Malaysia Airlines Flight 370 intensified Monday as officials confirmed that the last words spoken from the cockpit came after a key signalling system was manually disabled. US intelligence efforts also were focusing on Captain Zaharie Ahmad Shah and his first officer, Fariq Abdul Hamid, according to a senior US lawmaker. "I think from all the information I've been briefed on from, you know, high levels within homeland security, national counterterrorism centre, intelligence community, that something was going on with the pilot," said Michael McCaul, the chairman of the House Homeland Security Committee. Malaysia's Transport Minister Hishammuddin Hussein confirmed that an apparently relaxed final voice communication from the cockpit -- "All right, good night" -- came after the Aircraft Communications Addressing and Reporting System (ACARS) had been deliberately shut down.