PARIS (Reuters) - The areas around the Arc de Triomphe and Eiffel Tower in central Paris have been reopened after briefly being evacuated on Tuesday for security alerts, police told Reuters. The Arc de Triomphe area and surrounding subway stations had been evacuated following a bomb alert, but by 1630 GMT traffic was back to normal, police and witnesses said. The Paris Champ de Mars park around the Eiffel Tower had also been evacuated briefly following the discovery of a bag filled with ammunition. Two local French news sites showed pictures of a blue bag with different kinds of ammunition.