Manhunt Underway for Suspect in Terror Attack on Christmas Market in Germany

Report reveals that for months, German authorities had been tracking the suspect, who left his ID in the truck used in the attack.
3:18 | 12/22/16

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Transcript for Manhunt Underway for Suspect in Terror Attack on Christmas Market in Germany
A warpt has been issued in Germany and all across Europe for the arrest of this man, an asylum seeker believed to have ties toed are calls. Tonight, German officials say they have been tracking him for month. And now, the obvious question. If he was in trouble before, how did he slip through? ABC's Matt Gutman, again from Berlin. Reporter: Tonight, a europe-wise dragnet for this man. 24-year-old anis amri of Tunisia. Germany warning he could be armed about dangerous. According to a German lawmaker, his wallet and I.D. Were found in the cab of that battered semitruck after it bulldozed through this crowd Ed Berlin Christmas market, killing 11 and injured dozens more. He was long on the radar of German terror officials. Today, the A.P. Obtaining this alert going out to international police, noting he has used six aliases in three countries. He came to Germany in 2015 seeking asylum, but it was denied. Officials concerned about his ties to radical islamists and allegations of petty crime. Germany trying to deport him, but he didn't have the paperwork to prove that he was Tunisian. Affording to the A.P., jer Nan authorities had him under surveillance until April. Today, police searching this home for refugees where he's believed to have stayed. Police aren't saying amri drove the truck into the market. That semibelieved to have been hijacked just hours before the attack, as its driver was hauling steel beams from Italy to Germany. That driver seen on this surveillance camera on a diner after calling his wife. His dead body was found in the battered truck. German officials saying he'd been shot, but no gun was found at the scene. The attack jarring Germany and its stoic chancellor, Angela Merkel. He's being increasingly challenged for her decision to welcome more than 1 million my grants. Tonight, protected by police in riot gear, members of Germany's far right gathered near the site of the attack. The voice you heard behind me is from a neo-nazi group. Past this line of dozens of officers to keep the peace, there is a pro-immigration rally that is far larger. In other parts of Berlin, a different response to the tragedy. The city's famed Christmas markets open once again. Germans seem to be listening to their government, coming back out to these Christmas markets, and while the crowds are what you would expect to see this time of year, what you wouldn't expect to see, police vans. And as Germans flock to these markets once again, we saw something else, too. Cranes placing these concrete barriers at the Alexander place market. Protection, should the unthinkable happen again. And Matt Gutman joins us live again tonight from Berlin. And Matt, I want to get back to this fast-moving investigation. The suspect was on their radar for months? Reporter: That's right. They were conducting surveillance against him for month, but for some reason, decided to call it off in September. They last spoke about him in November, and didn't hear about him until that attack. Now, as that manhunt continues, German investigators say they've wrapped up their investigation here at the site of the attack. That market will be open again tomorrow morning. David? Matt Gutman with us again tonight. Thanks, Matt. And president-elect Donald

This transcript has been automatically generated and may not be 100% accurate.

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