Is Vatican the next Target of Islamist Terrorists?

Reports said that Vatican received a warning from Israeli and US intelligence services that it could be the next target of Islamist Terrorists (ISIS or Al Qaeda) who are responsible in attacking Paris, France that killed 17 people.

But Vatican denied the reports and said it has not received any warning coming from government Intelligence personnel. Vatican said that even if it's not true, they're still tightening up security in the vicinity to avoid any attacks. Governments boosted its intelligence agency and scattered additional officers in the area.