mention a specific target or plot. since sunday's failed attack in garland, texas, there has been a flurry of bulletins from federal agencies sent to law enforcement offices around the country. one says isis' messaging is resonating with u.s.-based violent extremists. another says homegrown violent extremists may elude attention and attack with little or no warning. that's what happened at the prophet mohammed cartoon contest in garland. the f.b.i. told the police that elton simpson might be interested in the event, but bureau did not know simpson and his accomplice nadir soofi were planning an attack. f.b.i director james comey says there could be thousands of people in the u.s. following isis propaganda online. the f.b.i. prioritizes which to monitor most closely. today, comey held a conference call with representatives from about 500 police departments urging them to share