Mars Express, circling high above the surface, made the discovery on the Red Planet’s south pole, said agency scientist Jean-Pierre Bibring — an indication that Mars may once have sustained life. —Europe probe detects Mars water ice (CNN)

Interesting… CNN’s European version of the Mars story says “More than 40 years of Mars exploration have yielded inconclusive evidence of whether water was present on the planet,” while the American version of the story doesn’t interpret the previous finds as inconclusive at all: “NASA’s Mars Odyssey, also an orbiter, confirmed water ice at the north pole, along with dry ice — frozen carbon dioxide — in 2002.”

So who gets credit for the discovery?