Security is tight in Paris today as the city prepares for a massive Unity march and rally against terrorism.
More than one million people are expected to take part.
The rally is a huge security challenge for a nation on alert for more violence, after 17 people and three al-Qaida-inspired gunmen were killed over three days of attacks on a satirical newspaper, a kosher supermarket and on police.
World leaders attending include British Prime Minister David Cameron, German Chancellor Angela Merkel, Israeli Prime Minister Benjamin Netanyahu and Palestinian President Mahmoud Abbas.
Attorney General Eric Holder will represent the United States and then attend a special emergency meeting regarding the fight against terrorism with international leaders.
Chicago's French community is holding a Unity rally in Daley Plaza at 3 p.m. Sunday.