The pilots of two small private planes were held for questioning and released after intruding on air space reserved for President George W. Bush's helicopter campaign tour in Florida, the Secret Service said on Saturday. White House spokesman Trent Duffy said the president "was never in any danger." Bush's speech in Melbourne was drowned out briefly when two F-15 fighters appeared overhead. One F-15 appeared to intercept a small plane. Earlier, a small plane violated restricted air space around Lakeland. Bush campaigned in Fort Myers, Lakeland, Melbourne and Jacksonville in northern Florida. Secret Service spokesman Tom Mazur said the pilots were detained in both incidents for questioning and then were released. Mazur said Combat Air Patrol military jets escorted the planes to nearby airports. He said the incidents would be referred to the Federal Aviation Administration for follow-up.