EDISON - The U.S. State Department issued a terror warning for Europe after officials received what they say is credible information pertaining to a possible future attack.

The Obama administration is urging U.S. citizens to be extra vigilant when they're in public places such as tourist spots and transportation hubs.Officials did not say when or where a possible attack might occur but ask travelers to be cautious when traveling to European destinations, specifically England, France and Germany.

The State Department says the information leads back to al-Qaida and that the attacks may be similar to those which took place in Mumbai, India in 2008.

Europe has been a target of Islamic terror plots before; the worst took place in Madrid in 2004 which killed over 200 people.