Rainbow Bridge re-opens after simulated "attack"

Canadian, U.S. teams dealt with "nerve-gas"
May 12, 2010
John Burman

Source

The Rainbow Bridge has re-opened after a massive police and border-control emergency training exercise involving fake nerve gas...
Niagara police say the exercise began at 8:30 a.m. with the flatbed truck carrying an agricultural sprayer, driving onto the Rainbow Bridge from the Canadian side.
It involved actors playing roles in real time and emergency personnel are treating it as a ‘real’ event.’

I came across this reading some local news online. Very interesting that there are so many "mock attacks" being practiced in the area. Maybe it has something to do with the G20 meetings coming to Toronto in June this year?