Pittsburgh cancer center warns of cell phone risks PITTSBURGH - The head of a prominent cancer research institute issued an unprecedented warning to his faculty and staff Wednesday: Limit cell phone use because of the possible risk of cancer. Tornadoes rake parts of Kan., Okla.; 2 found dead Authorities checking on a car stranded in a field Saturday morning found two people killed by a powerful storm that raked the state a day earlier with more than a dozen tornadoes. Tornadoes rip through Colorado, Wyoming; 1 killed Tornadoes touched down in northern Colorado and southern Wyoming on Thursday, damaging buildings, flipping vehicles and killing at least one person.