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OPTIONAL FORM NO, 10 MAY 102 EDITION OSA Fem (at CPR} 101-148 UNITED STATES GOVERNMENT Memorandum TO: SAC, SEATTLE (16482) (P) — DATE! «42/30/71 FROM SA THOMAS J. MANNING SuB— E, F, SUBJECT; UNKNOWN SUBJECT; NORTHWEST AIRLINES “. FLIGHT #305, PORTLAND TO "SEATTLE, 31/24/71 CAA - HIJACKING; EXTORTION 00: SEATTLE Investigation at Longview RA territory, 11/30/71, coristed of contacts with all hospitals, doctor's clinics, in Clark, Cowlitz, Lewis, and Wahkiakum counties, all negative. Doctors and other medical locations being circularized with descriptive information and composite photograph by interested medical authorities. A four seater helicopter of the Bonneville Power Administration conducting air search in an area 20 X 20 miles with negative results. The three-day use of helicopters and fixed wing aircraft in the prime search areain the opinion of the writer has been completed. No information of value has been uncovered in this aerial surveillance. Information concernin re has been previously furnished an teletype sent to the Las Vegas Division this date. Close observation of terrain features in the search area composed of 500 square filles and has been flown for three days consists of the following: Around Lake Merwin in the northern most part of the Search area there is a ridge line which averages 1700. ‘feet? running in an east to westerly: direction with dense timber, extremely héavy undergroth and few clearings. Proceeding north and east of this location into Cowlitz County the terrain becomes more timbered with heavy growth of underbrush along the flight path Om were \ - Seattle ' Ms rse ya wk AG 401\ _ st att. _- DB Cooper-4223 Buy U.S. Savings Bonds Regularly on the Payroll Savings Plan