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Tuesday 29 September 2026 14:38:40 GMT
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2026-09-29 15:00:26
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![Room 641A is a telecommunication interception facility operated by AT&T for the U.S. National Security Agency, as part of an American mass surveillance program. The facility commenced operations in 2003, and its purpose was publicly revealed by AT&T technician Mark Klein in 2006.[1][2] Description Room 641A is located in the SBC Communications building at 611 Folsom Street, San Francisco, three floors of which were occupied by AT&T before SBC purchased AT&T.[1] The room was referred to in internal AT&T documents as the SG3 [Study Group 3] Secure Room. The room measures about 24 by 48 feet (7.3 by 14.6 m) and contains several racks of equipment, including a Narus STA 6400, a device designed to intercept and analyze Internet communications at very high speeds.[1] It is fed by fiber optic lines from beam splitters installed in fiber optic trunks carrying Internet backbone traffic.[3] In the analysis of J. Scott Marcus, a former CTO for GTE and a former adviser to the Federal Communications Commission, it has access to all Internet traffic that passes through the building, and therefore](/video/cover/7677893463265840398.webp)