Analysis Summary:

The CBS News article reports a shutdown of the Keystone pipeline after a "mechanical bang." While the "mechanical bang" claim is difficult to verify directly, the shutdown itself is supported by news reports of oil spills and pipeline issues. The article exhibits moderate bias through its brevity and lack of context regarding the history and controversies surrounding the Keystone pipeline.

Detailed Analysis:

• Claim:** Keystone oil pipeline shut down.
  • Verification Source #1, #2: Support the claim that the Keystone pipeline has been shut down due to oil spills.
• Claim:** Shutdown occurred after a "mechanical bang" reported by an employee.
  • Verification Source #1, #2, #3, #4, #5: Do not cover the specific claim of a "mechanical bang." This claim is unverified by the provided sources.
• General Context:** The article lacks context regarding the Keystone pipeline's history, controversies, and environmental concerns.
• Verification Source #3, #4, #5: Provide context about the Keystone pipeline's history and controversies, which the CBS article omits.

Supporting Evidence/Contradictions:

• Verification Source #1: Supports the claim of a Keystone pipeline shutdown due to an oil spill in North Dakota.
• Verification Source #2: Supports the claim of a Keystone pipeline shutdown due to an oil spill in Kansas.
• Verification Source #3: Provides context about the Keystone pipeline's controversies, which the CBS article lacks.
• Verification Source #4: Provides context about the Keystone pipeline's approval process, which the CBS article lacks.
• Verification Source #5: Provides context about pipeline shutdowns, which the CBS article lacks.
• The "mechanical bang" claim is not covered by any of the provided verification sources.