The London Metropolitan Police reportedly arrested a female security guard outside London's Olympic Stadium Tuesday, according to police officials.
After police searched the 40-year-old dog handler's car, she was arrested for "suspicion of possessing explosives," according to officials.
The Telegraph reported that the woman was carrying a plastic explosive and class A drugs.
A police statement said: "Searches were carried out at residential addresses in Kent and London, no further substances were found."
Since the woman apparently has a small amount of the substance, police are not treating it as a terror-related incident, a police spokesman told FoxNews.com. The incident did not represent a threat to the safety and security of the Olympic site.