EN FOTOS: Sede del Super Bowl 50
A Super Bowl 50 sign decorates a lookout point at Twin Peaks in San Francisco, Tuesday, Feb. 2, 2016. The Denver Broncos will play the Carolina Panthers in Super Bowl 50 Sunday, Feb. 7, 2016. (AP Photo/Jeff Chiu) (Jeff Chiu / AP)
A Super Bowl 50 sign decorates a lookout point at Twin Peaks in San Francisco, Tuesday, Feb. 2, 2016. The Denver Broncos will play the Carolina Panthers in Super Bowl 50 Sunday, Feb. 7, 2016. (AP Photo/Jeff Chiu) (Jeff Chiu / AP)
FILE - In this Sunday, Jan. 31, 2016, file photo, a San Francisco Police tactical unit officer patrols Super Bowl City in San Francisco, From ticket scalpers to terrorism, football’s biggest game always presents challenges large and small for law enforcement officials. Their task is made more difficult by the location of Super Bowl 50, some 45 miles from downtown San Francisco, and a number of events throughout the sprawling Bay Area in the run up to the game in Santa Clara on Sunday. (AP Photo/Jeff Chiu, File) (Jeff Chiu / AP)
FILE - In this Friday, Jan. 29, 2016, file photo, security members walk with dogs through a main entryway to the NFL Experience during a preview tour of Super Bowl 50 official fan attractions in San Francisco. From ticket scalpers to terrorism, football’s biggest game always presents challenges large and small for law enforcement officials. Their task is made more difficult by the location of Super Bowl 50, some 45 miles from downtown San Francisco, and a number of events throughout the sprawling Bay Area in the run up to the game in Santa Clara on Sunday. (AP Photo/Eric Risberg, File) (Eric Risberg / AP)
Feb 2, 2016; Santa Clara, CA, USA; Security guards check credentials at a security check point prior to Super Bowl 50 between the Denver Broncos and the Carolina Panthers at Levi’s Stadium. Mandatory Credit: Peter Casey-USA TODAY Sports ** Usable by SD ONLY ** (Peter Casey / Reuters Photo)
FILE - In this Feb. 12, 2015 file photo, the Port of Los Angeles, with some cargo loading cranes in the upright and idle position, are seen in this view from the San Pedro area of Los Angeles. For the second time in recent months, city officials say the Port of Los Angeles has failed to meet pollution-reduction requirements at a shipping terminal. (AP Photo/Nick Ut, File) (Nick Ut / AP)