Egypt's emergency prosecution released a student who was holding banners in front of the French embassy in Cairo that claimed he had information about the attacks that took place in Paris, Al-Ahram Arabic news website reported.

The student at the Business Administration School of 6 October University held banners that read, "I have information concerning the IS members who were behind the attacks" and "I want to get married but I need your financial help."

Mohamed was briefly detained then released.

Late Friday, seven attackers opened fire at Paris cafes, detonated suicide bombs near France's national stadium, and killed hostages inside a concert venue during a show by an American rock band — an attack in the heart of the City of Light.

The series of attacks left at least 129 people dead and 352 injured with 80 in critical condition.

The Islamic State group claimed responsibility in an online statement in Arabic and French circulated by supporters.

The attack brought an immediate tightening of borders as French President Francois Hollande declared a state of emergency and announced renewed border checks. Germany also stepped up border checks. 

A state of sympathy for victims went viral all over the world. Many people on Facebook have changed their profile pictures to France’s national flag as an act of solidarity shortly after the incident.

Horrifying survivor accounts in all locations of the attacks have been shared on social media.