1.   Loosen the bolt so the bars can be turned.

2.   Investigators said the wreck was caused by someone who intentionally loosened bolts and lifted rail spikes.

3.   That bolt was loosened but a wire was connected to keep the electrical current running, Amtrak officials said.

4.   Earlier last week, rail workers discovered bolts had been loosened on the same line.

5.   On Tuesday, spacewalkers James Newman and Michael Massimino loosened bolts on the doors leading to the power control unit and batteries.