"Bin Laden's elimination is good news, but we will be doing anything but lowering our guard as a result," said Maroni, speaking during a visit to the northern Italian city of Milan.
"L'Interpol has stated that the risk of terrorism has risen since Bin Laden's killing, a concern which I share." he said. "There is a risk of an immediate reaction," he added.
In a statement on Monday, Interpol chief Ronald K. Noble said Al-Qaeda had been dealt a severe blow by Bin Laden's killing but following his death urged countries' law enforcement authorities to guard against a heightened terror risk from Al Qaeda-affiliated or Al Qaeda-inspired terrorists.
Maroni said that later on Monday he would be meeting with colleagues to decide what extra security measures might be needed to protect citizens against a possible terrorist attack.
Al-Qaeda inspired cells and 'homegrown' jihadist groups such as those active in North Africa could pose a particular threat, according to the minister.