A massive 7.2 magnitude earthquake hit Alaska's remote Aleutian Islands late Thursday, but there were no reports of injuries or damage. A tsunami warning issued for some coastal areas of Alaska was canceled around an hour later. In the town of Dutch Harbor, hundreds of people climbed a hill after warning sirens went off, a longshoreman tells the AP. Residents said they felt the ground rumbling for about 20 seconds during the quake, which was centered around 1,200 miles southwest of Anchorage. (More earthquake stories.)