Guard arrested near Olympic Stadium in explosives probe
A security guard was arrested near the Olympic Stadium in east London on suspicion of possessing explosives.
The woman, a 40-year-old dog handler, was detained after her vehicle was searched by police in a car park off Pudding Mill Lane.
The Metropolitan Police said the arrest was made by Olympic site support unit (OSSU) officers after a tip-off.
Police, who do not believe the incident to be terror-related, have released the woman on bail.
Scotland Yard said a very small amount of a substance recovered by police was being forensically examined. It added the Olympic site's safety had not been at risk.
The woman, who was arrested on Tuesday, was bailed to return to an east London police station in late April.
Meanwhile, a 43-year-old man who was arrested on Wednesday at his home address in Wales on suspicion of possession of an explosive substance, remained in custody at an east London police station.
A spokesman for Olympics security provider G4S said: "Our canine services team is licensed to hold small samples of explosives for training purposes and are required to undertake rigorous training and follow strict operational processes.
"Our canine services teams are highly effective because the dogs are able to regularly train using 'live' training aids. All dog handlers are fully vetted and operate to the highest industry standards.
"G4S take breach of operational processes very seriously and are assisting the police with their inquiries in relation to this incident."
Police said another car had been stopped and searched by the OSSU on the M11, but the driver had not been arrested.
Searches were also carried out at residential addresses in Kent and London.
A spokesman for the Olympic Delivery Authority said: "There are robust measures to ensure the safety and security of the Olympic Park.
"We are working with the police in their investigation. At no point has the safety and security of the Olympic Park been put at risk."
The arrest came on the day building work was completed at the £486m Olympic Stadium.