WASHINGTON - Olympic swimming superstar Michael Phelps was arrested Tuesday in his home state of Maryland for driving under the influence of alcohol and speeding, police said. Phelps -- the most decorated Olympian of all time with 18 golds out of 22 total medals -- later apologized, saying he was "deeply sorry" for his actions. The 29-year-old was pulled over early Tuesday after his white Land Rover was clocked at 84 miles (135 kilometers) per hour in a 45 mph zone in Baltimore's Fort McHenry Tunnel, Maryland Transportation Authority Police said. "He was unable to perform satisfactorily a series of standard field sobriety tests," it added in a statement. Phelps has been charged with driving under the influence (DUI), excessive speed and crossing double lane lines.–AFP