Montgomery County Assistant Police Chief Wayne Jerman says that police at the scene on the day of the hostage crisis at Discovery headquarters in Silver Spring, Md., were prepared for the possibility that the bomb strapped to the gunman's chest would explode.
Jerman also says bomb technicians later determined that the device carried by James Lee would have killed people in the vicinity had it blown up.
Lee took two employees and a security guard hostage during the siege. It ended when he was shot and killed by police.
Jerman detailed the department's response to the hostage situation as part of a seminar on workplace violence prevention.