France has closed its borders and declared a State of Emergency.
With the high rate of casualties and the weapons used in these attacks, there is a high probability that the perpetrators have combat experience with either ISIS or an affiliate in Syria and have crossed over the border and into France with the waves of refugees being accepted.
(18:37 MST) At least 153 people were killed in the Paris and Saint-Denis shootings and bombings, French officials said. Among the victims, 112 were killed at the Bataclan concert venue, according to the Interior Ministry.
(18:07 MST) Deputy Mayor now confirms number of killed at 149.
(17:40 MST) Deputy Mayor Patrick Klugman states at least 118 confirmed killed in Paris attacks.
(17:31 MST) As many as 100 people were killed in the attack at the Paris concert venue Bataclan, police said Saturday, according to Agence France Presse. President Francois Hollande is on his way to the venue, according to AFP.
(17:19 MST) CNN affiliate BFMTV reports that French SWAT units have stormed the Bataclan concert hall and that the siege is over. Two attackers were killed, a police union said. Deputy Mayor Patrick Klugman told CNN that assault is over.
Klugman says the death toll in the attacks is going to rise significantly. "We are facing an unknown and historic situation in Paris," he said.
(16:57 MST) Several groups of police have burst into the Bataclan concert venue and a series of denotations have been heard from outside, a CNN producer said. A series of gunfire has been heard. Police have brought out at least 100 hostages, some appear to be wounded.
(16:44 MST) French radio reporter Julien Pearce was inside the Bataclan theater when gunmen entered. Two men dressed in black started shooting what he described as AK-47s, and after wounded people fell to the floor, the two gunmen shot them again, execution-style, he said.
The two men didn't wear masks and didn't say anything. The gunfire lasted 10 to 15 minutes, sending the crowd inside the small concert hall into a screaming panic, said Pearce, who escaped. He said he saw 20 to 25 bodies lying on the floor. The hostage situation at the Bataclan continues into early Sunday.
(16:32 MST) One of the explosions at the Stade de France outside Paris appears to be a suicide bombing, a Western intelligence source receiving direct intelligence from the scene told CNN's Deb Feyerick. A dismembered body, consistent with the aftermath of an explosion from that type of device, was found at the scene, the source said.
(16:25 MST) At least 60 people have died in the attacks, CNN affiliate BFMTV reported.
(16:25 MST) At least six shootings took place in Paris and three explosions took place at the Stade de France in Saint-Denis late Friday, CNN affiliate BFMTV said. Two or three gunmen entered the Bataclan concert hall while opening fire on law enforcement, BFMTV reported.
(16:25 MST) A source earlier told CNN there were six to eight hostage takers, citing a person they were talking to inside the venue. Attackers reportedly used AK-47 automatic weapons.
(16:25 MST) Larger death tolls expected as gunfire and reported shootings of hostages inside Bataclan concert hall continues.
What to expect in the coming hours:
As details emerge, there is a high probability that terrorists involved will have been some of the refugees accepted by France as the move by France to close its borders is revealing of their intel on suspected perpetrators.
The large scale attacks and the weapons involved point to an underground cell not only smuggling weapons but having an extensive network of extremists below the radar of French authorities.
This will no doubt be an attack claimed by the extremist group ISIS.
This article will be updated as more information becomes available.