Rally against terrorism in France and a million join together

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Paris, FR - As day turned to night in France, a heartbroken nation gathered to grieve what's being called  France's 9-11.

Up to a million people gathered in the streets of Paris following three days of terror that left 17 people dead in the past week. The nation remains on high alert after security forces fatally shot a man who police said killed four hostages friday at a kosher supermarket in eastern Paris. The same day, police killed two brothers they say attacked the Paris office of satirical magazine Charlie Hebdo and left 12 people dead. On Thursday a policewoman was killed south of Paris.

According to French police, law enforcement officers have been told to erase their social media presence and carry weapons at all times because terror sleeper cells have been activated in the country.

World leaders and dignitaries, including U.S. Attorney General Eric Holder, attended the unity rally.

"We have seen these kinds of attacks, or attempts at these kinds of attacks, certainly in the United States," said Holder. "We've seen things like this in the United Kingdom. We've seen this in Nairobi, Australia, Canada. This is the nature of the new threat we must confront."

Also a gathering spot Sunday was the Grand Synagogue in Paris. Amid terror threats, it was closed Friday for the first time since World War II, but on this day it was wide open for support. The number of Jews leaving France to move to Israel has soared following a spike in attacks on Jews there.

Said Haim Korsia, Chief Rabbi of Paris, "To fight against terror is very easy, we just have to be together, to be safe of course and to really be together. It`s a dream of France."

Following the rally, the Eiffel Tower was fully lit and sparkling with hope.