terror investigation is underway into today's deadly shooting attack in the heart of Paris. The shooting at the historic Champs-Elysees killed a police officer and seriously wounded another.  

There are reports that there could have been two gunmen, and one may have been killed.  Right now, forensic teams are gathering evidence from a gray sedan at the scene.  Evidence markers litter the ground, which may indicate the locations of spent bullet casings. 

The Champs-Elysees area includes the Arc de Triomphe landmark, and is the finish of the Tour de France.

The shooting takes place a few days before a presidential election in France.  The first round of voting will take place on Sunday.  It's a four-way race, and is considered France's most unpredictable vote in decades. 

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