Spokesman Ed Donovan said the man was immediately taken into custody by Secret Service agents who guard the complex around the clock.
Securicor Gray, the company contracted to guard the complex, said the 21-year-old suspect has been working for the company since it began patrolling the property late last year.
Police are guarding the apartment complex where the woman lives in Dallas as decontamination work is carried out.
Police have been guarding the apartment complex, where a barrel labelled "biohazard" could be seen on a lawn outside.
On Thursday, some of Bangkok's notoriously congested roads were temporarily cleared for her motorcade and hundreds of police officers were deployed to guard the sports complex.
More than 1,000 police officers and members of the elite Rapid Action Battalion guarded the court complex.
Chanting, "No Americans, no Saddam, all the people are for Islam," the crowd blocked one street, but it carefully avoided a confrontation with dozens of soldiers guarding the entrance to the palace complex.
You must be accompanied by your employer pior to enter any office complex as Singaporean police officers guard the entrances to office complexes and sneaking in illegally will result in caning for illegal activities.
Mary Lee, who said she has worked as a security guard at the complex for 20 years, said she and another guard had tried to break up the fight.
Their duties will be assumed by Cambridge Security Services, a Manhattan company, which has assigned 24 security guards to the complex, said Michael Grasso, director of security.
Ms. Negron complained that the security guards in the complex had merely asked the teenagers to leave the premises instead of acting to stop the fight or calling 911 quickly.
