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PARIS  — The head of Paris police says all attackers are believed to be dead.

Paris Prosecutor Francois Molins says the death toll in attacks at six sites around the French capital could exceed 120.

Speaking near a popular music venue where scores of people were taken hostage, Molins said early Saturday that five attackers may have been killed.

The Paris hospital service says medical personnel are reporting for work of their own accord to help treat the injured in the multiple attacks in the city, and that others were being called in as part of a plan to deal with emergencies.

Among those called in minutes after the first reports went out was Patrick Pelloux, an emergency room doctor and former writer for Charlie Hebdo. Pelloux was also among the first to see the aftermath of the Jan. 7 attacks.

At least 100 people died in a Paris concert hall where attackers seized hostages Friday, an official said. At least five other terror attacks unfolded across the city in the deadliest violence Paris has seen since World War II.

 French President Francois Hollande says he is closing the country’s borders and declaring a state of emergency after several dozen people were killed in a series of unprecedented terrorist attacks.

Hollande, in a televised address to his nation, said the nation would stand firm and united against the attackers.

He said security forces are assaulting one of the sites hit by Friday’s attacks, without elaborating.

“It’s a horror,” he said.

Multiple officials, including one medical official, put the number of dead at between 35 to 40 people.

All officials spoke on condition of anonymity because they were not authorized to be publicly named according to police policy.

President Barack Obama is calling the attacks  “outrageous attempt to terrorize innocent civilians” and is vowing to do whatever it takes to help bring the perpetrators to justice.

Speaking to reporters at the White House, Obama said he would not speculate about who was responsible.

He called the attacks a “heartbreaking situation” and an “attack on all of humanity.”

Obama was briefed on the attacks Friday by his counterterrorism adviser Lisa Monaco.

The attacks come as the president is preparing for two trips abroad. He’s slated to leave Saturday for a nine-day trip to Turkey, the Philippines and Malaysia. He due to travel to Paris for climate change talks at the end of the month.

Chicago Police issued a statement this evening saying:

CPD is actively monitoring the tragic events unfolding in Paris, France.  Currently there is no credible threat or nexus to Chicago.  In the interest of public safety, we remain in constant contact with our federal and international partners to evaluate and respond to any changes in intelligence.  Our prayers and deepest sympathies go out to all those affected by this unspeakable violence.

Twitter accounts linked to jihadists are celebrating the attacks in Paris.

According to the SITE Intelligence Group tracking militant sites, Twitter posts attributed to jihadist supporters are speculating which group may be responsible. Many users expressed belief that the Islamic Group could be behind the carnage.

They used Arabic-language hashtags that translated to “Paris on fire” and “Caliphate state strikes France.”

SITE says that accounts also circulated pictures of the attacks, and one pro-IS channel accused France of sending warplanes to bomb Syria and says “today it drinks from the same cup.”