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Suspects in Charlie Hebdo attack, store siege killed

French security forces on Friday killed the two brothers suspected in the Charlie Hebdo massacre while raiding a printing facility where they had holed up with a hostage, who was freed unharmed, according to multiple reports.

Meanwhile, at a separate siege of a kosher supermarket in Paris four people, as well as a gunman, were killed, according to NBC News. French police are now searching for a woman said to be an accomplice of Amedy Coulibaly, the suspected hostage-taker at the kosher market, U.S. law enforcement told NBC News.

A Paris prosecutor said Coulibaly killed four people when he entered the kosher market on Friday, the Associated Press reported. Fifteen hostages in the store were later set free, the AP said.

The three-day terror spree has become one of the worst the country has seen in decades. After the clashes on Friday, French President Francois Hollande said the threats to France—in the form of terrorism and racism—were not done.

He praised the work of law enforcement and security forces in handling the hostage situations, adding that France will continue to increase security in public places. Hollande stressed French unity in the aftermath of the attacks, cautioning against racism.

Earlier on Friday, Said Kouachi, 34, and his 32-year-old brother Cherif Kouachi, who were wanted in the killing of 12 people at the French satirical publication, came out firing at police after they stormed the printing shop, according to several reports.

A member of al-Qaida's branch in Yemen told the Associated Press on Friday that the group had orchestrated Wednesday's attack on Charlie Hebdo "as revenge for the honor" of Islam's Prophet Muhammad. The publication had previously published cartoons depicting Muhammad.

The Yemeni branch's leadership chose the target "carefully," the member told the AP. U.S and European sources close to the investigation said on Thursday that one of the brothers, Said Kouachi, was in Yemen in 2011 for a number of months training with Al Qaeda in the Arabian Peninsula (AQAP), one of the group's most active affiliates.

Before security forces raided the brothers' location on Friday, four explosions were heard at the site of the assault in the town of Dammartin-en-Goele, a 12 kilometer (seven-mile) drive from Charles De Gaulle Airport. Police cordoned off an industrial estate, and French news channel France 24 reported that 1,000 officers were involved.

The two brothers had been cornered by police inside a printing house in Dammartin-en-Goele. One police officer told The Associated Press earlier that the suspects told negotiators they "want to die as martyrs."

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A police official earlier told reporters the grocery store gunman was believed responsible for the roadside killing of a Paris policewoman on Thursday. Authorities released a photo of him and a female accomplice but were unclear about her whereabouts.

Police have closed down a ring road that circles Paris near the kosher supermarket, which would have busy ahead of the approaching Jewish Sabbath at sundown.

Flights diverted

To stop the suspected killers from finding out where the search was being focused, the French police force asked journalists via Facebook to stop filming in the area.

Hours earlier, the brothers stole a Peugeot amid gunfire, the Associated Press reported, quoting an official.

Aéroports de Paris confirmed Friday that that some flights heading into Charles De Gaulle Airport had been diverted. In light of the attacks in France and last month's hostage standoff in Sydney, the United States on Friday evening issued a global travel warning, citing an increased risk of attacks on Americans and reprisal for the U.S.-led intervention against Islamic State militants, the AP reported.

French President Francois Hollande said the attack on satirical magazine Charlie Hebdo, where 12 people were killed, was the worst in France for 50 years. A meeting of interior ministers of European states would be held on Sunday, he added. A meeting scheduled for Sunday between the leaders of France and Germany has been postponed, French President Francois Hollande's office said on Friday in light of the current security operations.

The suspects were French-born sons of Algerian-born parents and were already under police surveillance. One was jailed for 18 months for trying to travel to Iraq a decade ago to fight as part of an Islamist cell. Police said they were "armed and dangerous."

U.S. government sources said Said and Cherif Kouachi were listed in two U.S. security databases, a highly classified database containing information on 1.2 million possible counter-terrorism suspects, called TIDE, and the much smaller "no fly" list maintained by the Terrorist Screening Center, an interagency unit.

Read MoreTerror shooting suspects spotted in east France: Reports

Aurelien Meunier | Stringer | Getty Images

U.S. President Barack Obama said on Friday that he offered law enforcement and counter-intelligence support to aid France. He added that "the United States stands with you today, stands with you tomorrow."

On Thursday, Obama made an unannounced visit to the French Embassy in Washington to pay his respects.

He wrote in a condolence book, "As allies across the centuries, we stand united with our French brothers to ensure that justice is done and our way of life is defended. We go forward together knowing that terror is no match for freedom and ideals we stand for - ideals that light the world."

Markets were tracking developments in Paris, as well. Stocks closed lower across the three major U.S. indexes on Friday, and while markets largely reacted to the morning's jobs report, the hostage situations helped drive uncertainty.

"It was a really positive jobs report. I know the market sold off here in an aftermath reaction, but we just had an incredible rally, it's a Friday, we have the situation in Paris, we're setting up for the upcoming weekend and we have earnings starting next week," JJ Kinahan, chief strategist at TD Ameritrade, said of investor unease.

--Reuters and The Associated Press were used in the writing of this story