Marc Coma of Spain - the defending bike champion - won Monday's 185-mile second stage of the Dakar Rally and took the category lead.
This year's rally, considered one of the most dangerous in motor sports, has already claimed three lives.
Argentine bike rider Jorge Martínez Boero died in a crash on Sunday's first stage. On the same day, the pilot of an ultralight plane and his son died when the aircraft went down while following the race. Rescue officials identified the dead as Luis Marcelo Soldavini, 37, and son Tomás, 11.
Coma finished the special stage in 3 hours, 7 minutes, 21 seconds. He was 1:18 ahead of KTM teammate Cyril Despres of France and 2:33 ahead of Spanish rider Joan Barreda Bort.
In the overall standings, Coma was 2:30 ahead of Francisco López of Chile and 2:52 in front of Despres.
"The start was very fast," Coma said. "Chaleco (López) and me were riding at top speed. ... After that, arriving at the second part of the special with sand and dunes, it was a lot more technical with some navigation to do. I took the lead and kept riding at a good pace. I'm happy because I didn't get lost. So, it's been a good day for me."
Al-Attiyah, driving a Hummer this year, finished the stage in 2:47:18. He was 54 seconds in front of Peterhansel in a Mini, and 2:42 ahead of Hummer teammate Robby Gordon of the United States.
In the overall, Peterhansel is 2:28 ahead of Gordon and 2:33 in front of first-day leader Krzysztof Holowczyc of Poland.
Al-Attiyah is in sixth place overall, 8:47 back.
Based on reporting by the Associated Press.