I am Charlie: Millions participate to honour those killed in France

Thousands of people gather at Republique Square in Paris, Sunday, Jan. 11, 2015. Thousands of people began filling France’s iconic Republique plaza, and world leaders converged on Paris in a rally of defiance and sorrow on Sunday to honor the 17 victims of three days of bloodshed that left France on alert for more violence. (Source: AP)

Charlie Hebdo newspaper staff, with cartoonist Renald Luzier, known as Luz, front third left with mustache, march with relatives, right, of Jewish victim of the koscher supermarket, Michel Saada, in Paris, France on Sunday (Source: AP)

Police block a street to hold back the public demonstration near Place de la Republique in Paris (Source: AP)

From the left, Israeli Prime Minister Benjamin Netanyahu, former French President Nicolas Sarkozy, Malian President Ibrahim Boubacar Keita, French President Francois Hollande, German Chancellor Angela Merkel, Palestinian Authority President Mahmoud Abbas, Italian Prime Minister Matteo Renzi march during a rally in Paris on Sunday (Source: AP)

Laura Dugué, originally of Toulouse, France, symbolically holds a pen in the air as several hundred people gather in solidarity with victims of two terrorist attacks in Paris, one at the office of weekly newspaper Charlie Hebdo and another at a kosher market, in New York's Washington Square Park, Saturday, Jan. 10, 2015. (AP Photo/Jason DeCrow)

An attendee waves a French flag as several hundred people gather in solidarity with victims of two terrorist attacks in Paris. (AP Photo/Jason DeCrow)

An attendee wears a sign reading " I am Ahmed" as several hundred people gather in solidarity with victims of two terrorist attacks in Paris. The sign refers to Muslim policeman Ahmed Merabet, who was shot dead outside the office of Charlie Hebdo. (AP Photo/Jason DeCrow)

Attendees hold "Je Suis Charlie" (I am Charlie) signs in New York's Washington Square Park, Saturday, Jan. 10, 2015. (AP Photo/Jason DeCrow)

Attendees holds signs and chant the slogan "Je Suis Charlie" (I am Charlie) as several hundred people gather in solidarity with victims of two terrorist attacks in Paris. (AP Photo/Jason DeCrow)

Thousands of attendees hold "Je Suis Charlie" signs in New York's Washington Square Park, Saturday, Jan. 10, 2015. (AP Photo/Jason DeCrow)

An attendee symbolically holds a pen in the air while chanting "Je Suis Charlie" as several hundred people gather in solidarity with victims of two terrorist attacks in Paris, one at the office of weekly newspaper Charlie Hebdo and another at a kosher market, in New York's Washington Square Park, Saturday, Jan. 10, 2015. (AP Photo/Jason DeCrow)

Street performer Carolyn Chiu holds a "Je Suis Charlie" (I am Charlie) sign during her act in New York's Washington Square Park, Saturday, Jan. 10, 2015. (AP Photo/Jason DeCrow)