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Soldiers stand front of the Signoria and Uffizi Museum square as they check the area in Florence, 25 March 2016. Security measures were tightened around the Florence monuments and touristic areas after the attacks in Brussels. Security services across Europe are on high alert following two explosions in the departure hall of Zaventem Airport and later one at Maelbeek Metro station in Brussels, Belgium, 22 March 2016. Many people have died and more have been injured in the terror attacks, which Islamic State (IS) has since claimed responsibility for. ANSA/MAURIZIO DEGL INNOCENTI (ANSA via AP)

Soldiers stand front of the Signoria and Uffizi Museum square as they check the area in Florence, 25 March 2016. Security measures were tightened around the Florence monuments and touristic areas after the attacks in Brussels. Security services across Europe are on high alert following two explosions in the departure hall of Zaventem Airport and later one at Maelbeek Metro station in Brussels, Belgium, 22 March 2016. Many people have died and more have been injured in the terror attacks, which Islamic State (IS) has since claimed responsibility for. ANSA/MAURIZIO DEGL INNOCENTI (ANSA via AP)