A Texas lab can't find a frozen vial of virus that is a potential bioterror agent. Lab officials say it's most likely the vial was accidentally destroyed inside the facility.

Officials at a maximum-security research lab in Texas report that a vial of a potential bioterror agent is missing, but they say it's likely that the virus has been destroyed and poses no danger.

The incident, voluntarily disclosed by the Galveston National Laboratory, comes amid growing concerns about security and safety risks at labs researching germs and toxins that could be used as bioterror weapons...