Authorities question owner in Haiti school collapse

Alta Jean Baptiste, director of Haiti's Civil Protection Bureau, identified the man in custody as Fortin Augustin. Police and residents said Augustin, a preacher, owns the school called College La Promesse Evangelique. The school, on the outskirts of the capital, Port-au-Prince, caved in about 10 a.m. Friday while some students were attending class and others played outside. About 700 people were on school grounds at the time of the collapse, celebrating the school's birthday, said Abel Nazaire, deputy coordinator of risk and disaster management in Port-au-Prince. By Saturday night, the number of wounded at the school had risen to 150, but many more remained missing, Nazaire said. Anguished family members have crowded behind police tapes as rescue workers combed through the rubble. Watch as a CNN reporter describes the scene » Augustin turned himself in but has not been charged, said police spokesman Garry Desrosier. Don't Miss Death toll climbs as search continues in Haiti collapse Haitian President Rene Preval said the structure of the three-story school building was "really weak." He called for a review of construction guidelines. Officials said it has not been easy to determine how many people were inside the building at the time of the collapse. Most of the students ranged in age from 10 to 20, officials said, but some are younger. Haitian press reports said kindergarten, primary and secondary students attended the school. On Saturday, rescue crews pulled out several children alive, prompting cheers and reviving hope among the anxious parents. But rescuers also found the bodies of 20 children and their teacher in a classroom. Watch how the search for survivors can be painful » "Throughout history, there's been people found 48, 72 hours later -- still alive, in good shape," said Michael Istvan of the U.S. Agency for International Development, one of several agencies helping with the recovery effort. Rescue workers punched holes in the concrete and sent down cameras looking for signs of life. A crane lifted chunks of concrete, while dogs were brought in to help with the recovery effort. One of the biggest concerns: vibrations from the power generators. Officials worry that too much vibration can shake loose pieces of concrete on the damaged hillside structure, sending them tumbling down and causing more casualties. Parents have kept vigil in a ravine behind the collapsed school. They've been clutching pictures of their children and mouthing prayers as rescuers continued the slow, thorough process of picking through the pieces.

CNN's David Mattingly in Petionville and Lee Garen in Atlanta contributed to this report.