The US Secret Service ordered Dallas police to stop screening for weapons at a campaign rally for Barack Obama, according to reports in a Texas newspaper.
Police were told to stop checking people for weapons at the front gates of the Reunion Arena over an hour before the Democratic presidential hopeful appeared on stage on Wednesday, according to a report in Texas newspaper the Star Telegram.
Officers handling security were reportedly ordered to put down metal detectors and to stop checking bags and purses. Several Dallas police officers said they believed it was a lapse in security.
Chief T W Lawrence, head of the Dallas Police's homeland security and special operations divisions, said that while the crowd appeared " friendly" he was still surprised by the great number of people who had entered the building without any checks.