Madonna gives impromptu concert in Paris square

PARIS, France -- Pop star Madonna has staged an impromptu concert at Paris' Republique plaza to honor victims of the Nov. 13 attacks in which 130 people died.

The singer, who had just finished her show in Paris Wednesday evening, tweeted to her fans: "Im singing some songs in place de la republique. Meet me there now."

Accompanied by a guitarist, she performed songs including John Lennon's "Imagine" - a song that became an unofficial anthem in the aftermath of the attacks.

The iconic statue at Republique, transformed into an informal memorial since the attacks, is piled with flowers and candles left by passers-by.