The P-3C Orion American-made aircraft was over the coastal regions of southwestern Baluchistan province when it crashed, said officials.
The cause of the crash was not immediately known.
The aircraft disappeared from radar screens shortly after it took off this morning, officials said.
A search and rescue operation was launched and the wreckage of the aircraft was found six hours later near Pasni in Baluchistan, 210 miles west of the southern port city of Karachi.
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