A man known for robbing banks while wearing a mask of US President Barack Obama was arrested Thursday shortly after another robbery, Austrian police said. The suspect, was believed to be the same man who has already robbed half a dozen banks in Upper Austria province since 2008, always wearing a mask of the US president. On Thursday, the man, nicknamed the "Obama-robber" by the media, struck at another branch near the town of Voecklabruck and held a bank employee at gun-point before fleeing in a car, according to police.