Toe, The writes: The New York Police Department has quietly installed about 200 temporary surveillance cameras in midtown Manhattan to help spot trouble along 'Super Bowl Boulevard,' a 13-block street fair on Broadway that's expected to draw large crowds during the windup to the game. The temporary cameras for the Super Bowl festivities will supplement a system of thousands of permanent cameras covering midtown and Wall Street that the NYPD monitors from a command center in lower Manhattan. The department has pioneered analytical software that allows it to program the cameras to detect suspicious activity, such as a bag or other objects left in one place for a long time. Hazmat and bomb squads will be on standby. Others officers will patrol with bomb-sniffing dogs. Still more will watch from rooftops and from police helicopters. At a recent security briefing at the stadium, police chiefs and other officials said success will be measured in part by how well authorities conceal all the concern over potential threats.