; and (4) provide protection to the Deputy Secretary of Labor or another senior officer representing the Secretary of Labor at a public event if there is a unique and articulable threat of physical harm, in accordance with guidelines established by the Secretary. (b) Authorities The Secretary of Labor may authorize a law enforcement officer or special agent employed under subsection (a), for the purpose of performing the duties authorized under subsection (a), to— (1) carry firearms; (2) make arrests without a warrant for any offense against the United States committed in the presence of such officer or special agent; (3) perform protective intelligence work, including identifying and mitigating potential threats and conducting advance work to review security matters relating to sites and events; (4) coordinate with local law enforcement agencies; and (5) initiate criminal and other investigations into potential threats to the security of the Secretary, in coordination with the Inspector General of the Department of Labor. (c) Compliance With Guidelines A law enforcement officer or special agent employed under subsection (a) shall exercise any authority provided under this section in accordance with any— (1) guidelines issued by the Attorney General