Virginia Tech officials and local law-enforcement authorities faced pressure April 17 to explain how a gunman apparently avoided detection after killing two people and then went on to kill 30 others two hours later in the deadliest shooting rampage in modern U.S. history.

Police identified the gunman as Cho Seung-Hui, 23, a senior from South Korea. Seung-Hui killed himself in a classroom at Virginia Tech after opening fire on students and staff during class in an apparently premeditated massacre April 16.

Police said he appeared to have used chains to lock the doors and prevent terrified victims from escaping the building. Fifteen

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