The security portal (10) is dimensioned to be readily mounted and transported on a trailer (54) alone as a single security portal (10) or with a plurality of security portals to provide screening for a short term, high security event. The portal (10) includes bullet-resistant, bomb-blast proof and at least partially transparent walls (12, 14, 16, 18) and doors (22, 24, 26). Monitors (32, 34) are secured to the portal (10) for monitoring an individual within an interior (30) of the portal (10) for detecting weapons, bio-hazards, chemical toxins, illegal drugs, contraband, or other hazardous materials. The security portal also includes a security monitoring station (36) adjacent the security access door (26) and a bomb-blast enclosure (66) having a flap (68) and bomb-blast containment balloon (70) for containing hazardous materials in the event of a bomb-blast within the portal (10).