a new study finds that even slightly elevated blood pressure may increase your risk of stroke -- people. >> i'm sorry. i jumped. my blood pressure is up. it's the coffee. >> people whose pressure was at a higher number than normal. prehypertension, were 55% more likely to have a stroke. >> the study has some huge implications because one in three americans, one in three, a lot of adults in this country have prehypertension already. >> a big problem in this country for sure. >> it is, it is. >> keep away from that coffee. we'll tell you about later. >> not good. an fbi sting operation led to the arrest of an american citizen charged with plotting to blow up the pentagon and the capitol. >> investigators say he planned to use remote-controlled model planes, crammed with explosives to carry out his jihad against america. with more on this here is abc's pierre thomas. >> reporter: these huge remote control model planes seen here in a company sales video are