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-TELETYPF. TO SAC, UF HEARNAP 3) BY LETTER DATED MAY 10, 1974, FBI LABORATORY ADVISED: /SPECIMEN Q228 (VACUUM CLEANER BAG WITH RESIDUE FROM REAR SR@T AND FLOORBOARD) CONTAINS NUMEROUS BLACK SILICA SLAG Pp) TICLES AND A FEW METAL SHAVINGS. THEREFORE, IT IS LIKELY THAT THE PERSON OR PERSONS USING THE 1974 HORNET (BANK ROBBERY GETAWAY CAR) WERE IN A STEEL OR IRON MANUFACTURING AREA INASMUCH AS BLACK SILICA SLAG IS A COMMON BYPRODUCT OF SUCH AREAS. ALSO, IT IS NOTED .THAT BLACK SILICA SLAG IS COMMONLY USED IN SAND BLASTING OPERATIONS SUCH AS THOSE CONDUCTED AT NAVAL SHIPYARDS. ) | | THESE FINDINGS MAY OR MAY NOT BE INTERRELATED; NEVERTHELESS, THE RECURRENCE OF THESE NAUTICAL INDICATORS CANNOT BE IGNORED. DESPITE THE DISCOVERY OF THE SUSPECTS' EXTENDED OCCUPATION OF SYMBIONESE LIBERATION ARMY (SLA) PAD, 1827 GOLDEN GATE AVENUE. YOUR INVESTIGATION HAS BORNE OUT THAT SUSPECTS MAINTAINED SEVERAL "SAFE HOUSES" SIMULTANEOUSLY. THIS COUPLED WITH YOUR INTENSIFIED STREET OPERATIONS AND THE BELIEF FUGITIVES REMAIN IN SAN | FRANCISCO ENVIRONS ADD WEIGHT TO POSSIBILITY OF COASTAL OR WATERCRAFT HIDEOUT. BUREAU AWARE SAN FRANCISCO'S COASTLINE REPLETE WITH MARINAS. AND INCALCUABLE AREAS TO HIDE; THEREFORE, YOUR DISCRETION AND JUDGMENT MUST PREVAIL IN AFFORDING APPROPRIATE COVERAGE WHICH SHOULD INCLUDE, BUT NOT BE LIMITED TO, CIRCULARIZATION OF LOGICAL WATERFRONT CUSTODIANS, MARINE ASSOCIATIONS, SECURITY FORCES AND MARITIME INDUSTRIES IN THE BAY AREA. 7-3 ARMED AND DANGEROUS. -2-