(cnn) french police say two suspects in wednesday's terrorist attack on charlie hebdo magazine are still on the loose after escaping onto the streets of paris.









in a statement on their website, french national police ask for information on the whereabouts of suspects cherif kouachi and said kouachi, warning that both could be armed and dangerous.









police released photos of the two men, who paris deputy mayor patrick klugman told cnn are brothers in their 30s.









cherif kouachi, left, and said kouachi, right, are suspects in the paris attack.









police found an id document of said kouachi at the scene of the shooting, cnn affiliate bfmtv reported. "it was their only mistake," said dominique rizet, bfmtv's police and justice consultant, reporting that the discovery helped the investigation.









citing sources, the agence france presse news agency reported that an 18-year-old suspect in the attack had surrendered to police. cnn has not independently confirmed whether the suspect has surrendered.









police fanned out across france in an intense manhunt for the suspects, who were masked and dressed in black when they burst into the satirical magazine's office wednesday, killing 12 people.









a tactical unit was deployed in an operation about a 144 kilometers (about 90 miles) from paris in reims, france, following the attack, cnn affiliate bfmtv reported. authorities haven't revealed details about the target of the operation, but speculation surged in french media that investigators could be closing in on the suspects.









french authorities vowed to step up security and apprehend those responsible.









"everything will be done to arrest (the attackers)," french president francois hollande said in a speech wednesday night. "... we also have to protect all public places. security forces will be deployed everywhere there can be the beginning" of a threat.









it's too soon to say whether the suspects were operating alone, cnn terrorism analyst paul cruickshank said.









the gunmen said they were avenging the prophet mohammed and shouted "allahu akbar," which translates to "god is great," molins said.









a witness who works in the office opposite the magazine's told bfmtv that he saw two hooded men, dressed in black, enter the building heavily armed.









"we then heard them open fire inside, with many shots," he said. "we were all evacuated to the roof. after several minutes, the men fled, after having continued firing in the middle of the street."









the men reportedly spoke fluent french with no accent.









one unsettling video, posted to youtube, shows two men shooting on a paris street, then walking up to and firing point-blank at a seemingly wounded man as he lay on the ground.









video shows a gunman approaching his getaway car and raising his finger in the air in what appears to be a signal, possibly to another vehicle or other people who might have played a role in the attack, a western intelligence source briefed on the french investigation told cnn.









'parisians will not be afraid'









at an event in paris' place de la republique, demonstrators held up pens in honor of the slain cartoonists and chanted, "we are charlie!" pictures posted online showed similar demonstrations in other cities, including rome, berlin and barcelona.









"parisians will not be afraid," klugman said. "we will fight terrorism with our common values, freedom, freedom of speech, freedom of the press. ... we are at war, but we still want to behave as a leading democracy."









armed soldiers could be seen standing guard outside monuments, in transit stations and elsewhere in well-trafficked spots around france by wednesday evening.









police impounded a black citroen in northeastern paris similar to the one purportedly used by the attackers as a getaway car. video from cnn affiliate bfmtv shows the vehicle being towed from porte de pantin, in paris' 19th district.









investigators will do a complete dna work-up on the citroen, including soil signatures that might suggest where the gunmen came from, a western intelligence source briefed on the probe told cnn.









the same source said that french authorities are searching all travel records from the past 17 days to see whether any of the attackers entered the european nation over the holidays. this includes checks at charles de gaulle and orly airports, as well as whatever limited information is available from train stations.









thursday will be a national day of mourning for those killed in the attack, hollande said. he asked for a moment of reflection thursday and said flags will be at half-staff for three days.









its last tweet before wednesday's attack featured a cartoon of isis leader abu bakr al-baghdadi.









earlier cartoons depicting the prophet mohammed spurred protests and the burning of the magazine's office three years ago.









a year later, in an interview with le monde newspaper, charbonnier gave little indication that he planned to change charlie hebdo's ways.









"it may sound pompous," he said, "but i'd rather die standing than live on my knees."









the attack on the magazine spurred a wave of support for the publication and its practices around france and the world.
charlie hebdo attack: suspects' names, photos released
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