More than 2,500 people have been arrested in the unrest, French officials said.
The explosion caused "material damage" but there were no casualties and the site, the official said, "has been secured".
Several Democrats considering 2028 presidential runs are attending the Munich Security Conference in Germany.
Troops from several European countries are arriving in Greenland in a show of support for Denmark as talks between representatives of Denmark, Greenland and the U.S. highlighted "fundamental disagreement."
Iranian President Masoud Pezeshkian said that Tehran is in a "full-scale" war with the U.S., Israel and Europe.
President Trump ramped up his anti-immigrant rhetoric, complaining about immigration from Africa rather than Europe.