PARIS — The Eiffel Tower is going dark to pay homage to the victims of two tragedies: the weekend knife attack in the French port city of Marseille and the mass shooting in Las Vegas.

Paris Mayor Anne Hidalgo tweeted Monday that “Tonight we turn off the lights of the Eiffel Tower at midnight” (2200 GMT) to honor the victims of the two attacks, continuing a practice of bowing in respect to victims of horror by darkening the glittering monument that crowns the City of Light.

The Islamic State group claimed responsibility for the stabbing deaths Sunday of two women in their early 20s at Marseille’s train station, and the killing of 58 at a Las Vegas concert. In each case, authorities are searching for links between the killers and the organization.