A firefighter who was standing on a telescoping ladder when it collapsed onto a three-story building in Boston suffered no serious injuries. Boston Fire Commissioner Joseph Finn said the firefighter was suspended about two feet above the building Wednesday night when the ladder buckled. He was able to safely climb out of the ladder's bucket onto the roof. Finn said it's too early to know the cause of what he described as a "catastrophic failure" of the ladder truck. He said the truck was a backup being used while another truck was repaired. It is about 13 years old, but he said it has had extensive maintenance. A crane was brought in to lower the ladder to street level.