A letter warning against the upcoming visit of French President Francois Hollande to India was delivered to the French consulate in Bengaluru, according to news agency ANI.

The letter was reportedly mailed from Chennai.

President Hollande arrives in India on January 24 for a three-day visit.

He will land in Chandigarh where he will be received by Prime Minister Narendra Modi.

The French leader is the Chief Guest for the massive Republic Day parade in Delhi on Tuesday.

A recent review of security, customary ahead of Republic Day, was led by Home Minister Rajnath Singh and officials concluded that an ISIS threat "is very real".

Four men were arrested in Uttarakahand last night for alleged ISIS links. A senior Delhi Police officer has alleged they were planning a large attack on Delhi.  In November, ISIS gunmen devastated Paris, leaving 130 people dead after firing at a cafe, a rock concert, and other public places.