WASHINGTON: US Attorney General Eric Holder said Sunday there was no “credible information” as yet that Al-Qaeda was behind the attacks in France that have killed 17 people.

“At this point, we don’t have any credible information that would allow us to make a determination as to which organization was responsible,” Holder said in an interview from Paris with ABC’s ‘This Week.’

He said, “We’ll certainly have to see exactly who was responsible (to) determine what kind of retaliation would be appropriate. But we stand in solidarity with the French.”

Holder spoke as dozens of heads of states joined hundreds of thousands of people in a massive display of unity and defiance against terrorism on the streets of Paris. The country has been deeply shaken by three days of bloodshed that began Wednesday when two brothers stormed a satirical newspaper in Paris, killing 12 people, including some of France’s best known cartoonists. Four more people were killed Friday in a hostage standoff at a kosher supermarket in Paris by a third gunman, who had shot to death a policewoman the day before.