Dozens killed in terrorist attacks in Paris

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      (Editor's note: After this story was published, the Associated Press cited an unnamed official saying at least 100 people died inside the Bataclan concert hall.)

      Terrorism has struck the City of Light for the second time this year.

      The BBC has reported that at least 40 people have been killed in shootings at different locations.

      Residents are being asked to stay indoors after at least 15 people were murdered near the Bataclan arts centre. Others have reportedly been taken hostage and gunmen are shooting them one-by-one.

      At three others were killed at the Stade de France, which is the country's most famous football stadium.

      More were murdered at Le Petit Cambodge restaurant in the 11th arrondissement.

      Parisians are using the hashtag #PorteOuverte to offer shelter.

      French military officials are patrolling the streets.

      Prime Minister Justin Trudeau issued the following message over Twitter:

      Meanwhile, President Barack Obama has called the killings "an attack on all of humanity and the universal values that we share".

      In early January, tens of thousands rallied in Paris after gunmen attacked the satirical weekly Charlie Hebdo and a Jewish grocery store. A police officer was also killed while directing traffic in the same week.

      Here's an early report by ABC News.