Terror Threat

Officials probe 'credible' terror threat

A specific but unconfirmed threat of a car bomb plot is being investigated as Sept. 11 nears.

Potential targets 

Also: 

• Obama ups security effort
• NYPD takes extra steps
• Military raises alert level

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Officials chase unconfirmed bomb threat

Authorities are on alert following a tip that al-Qaida plans to set off a car bomb near Sept 11.  

Three people sought 

Also: 

• Added security for NYC
• U.S. won't shy from force
• Hunt for next big attack