"RIM today is not really on our radar, " says Andrew Stein, director of mobile business development for PopCap Games Inc.

WSJ: BlackBerry Maker Hopes New Tools Lure Customers From iPhone, Other Rivals

"I worry about the vulnerability of mass transit because we know they've been on al Qaeda's radar screen, " Robert Liscouski, a former director of infrastructure protection at the Department of Homeland Security, told CNN.

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Across the border in Pickens County, Alabama, radar indicated a tornado set down and the county emergency management director, Ken Gibson, said a path of damage had been left behind in the northwestern part of the county, which borders Mississippi.

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