Festus Keyamo, Aviation Minister

• All four crew members safe, says NCAA

•Aircraft grounded, flight crew placed under regulatory review

Emmanuel Addeh and Kasim Sumaina in Abuja

Minister of Aviation and Aerospace Development, Festus Keyamo (SAN), yesterday pledged a thorough investigation into the circumstances surrounding a private aircraft that departed an improvised landing site near Asaba without obtaining regulatory approval or air traffic control clearance.