Tunnel holding radioactive waste partially collapses in Washington state

• Emergency declared at Hanford nuclear reservation in state's south-east
• No one injured and officials detect no release of radiation

A portion of a storage tunnel that contains rail cars full of radioactive waste collapsed Tuesday morning, forcing an emergency declaration at the Hanford nuclear reservation in south-eastern Washington state.

Officials detected no release of radiation and no workers were injured, said Randy Bradbury, a spokesman for the Washington state department of ecology.