A manhunt is underway in Germany for 23-year old Tunisian Anis Amri, sought for his possible connection to this week’s horrific terror attack on a Berlin Christmas market that killed 12 people and injured dozens more.

Amri was already known to German police for involvement in an ISIS cell, and had been under police surveillance.

If Amri’s involvement is confirmed, this would make the Berlin attack the most recent case of what I have termed “Known Wolf” terrorism, and would mark the eighth such incident this year:

JUST IN: Law enforcement sources tell @CBSNews that police are searching for Anis Amri in deadly #Berlin attack. https://t.co/JxYOkthWCB pic.twitter.com/czBprqskTT — CBS This Morning (@CBSThisMorning) December 21, 2016

Berlin masscare suspect Anis Amri is probably armed and ‘highly dangerous’, security sources say https://t.co/h3SASJKmDU pic.twitter.com/iidGKqFUmm — Daily Mail Online (@MailOnline) December 21, 2016

Police hunt Tunisian suspect after finding ID papers in truck #BerlinAttack https://t.co/78UXRXBtn2 — WETM-TV (@WETM18News) December 21, 2016

The Wall Street Journal reports:

Authorities on Wednesday were seeking a 23-year-old Tunisian man who had been on the radar of intelligence services since last year as a suspect in the deadly truck attack at Berlin’s Christmas market, a German security official said. The man, identified as Anis A., had entered Germany in July 2015 and applied for asylum, the official said. He got temporary approval to stay in Germany even though his asylum application was rejected, the official said. German authorities had classified him as a potentially violent follower of the fundamentalist Salafi strain of Islam, and suspected ties to Islamic State, the official said. Another security official confirmed police were seeking the man. Investigators pinpointed him as their suspect after finding his residency permit in the cab of the truck used in the attack, they said. But the document was only found on Tuesday, during a more thorough search of the truck than the one that took place in the aftermath of the attack the previous night, according to one of the officials. The Tunisian man had used a number of different identities while in Germany, also claiming on some occasions that he was Egyptian or Lebanese, officials said.

Media reports indicate that Amri was already considered dangerous, and had asked a police informant to illegally acquire weapons:

@abususu @SPIEGELONLINE plus he was under surveillance and asked a Police informant for weapons. pic.twitter.com/d80OtjYPFh — Bob Roberts (@GabiElenaDohm) December 21, 2016

The Ministry of Internal Affairs for Northrhine Westphalia made a statement earlier today about what was previously known about Amri:

Statement von #NRW Innenminister Jäger aus aktuellem Anlass https://t.co/1D6pZI2fVB — Staatskanzlei NRW (@NRWpunktDE) December 21, 2016

@jenanmoussa >”his asylum request was denied in July 2016,but he could not be sent back to Tunesia because his papers were missing.He moved — Andrea (@Walrathis) December 21, 2016

@jenanmoussa “suspected that he was planning actions against state security.Further info can not be given, because of investigative reasons” — Andrea (@Walrathis) December 21, 2016

As regular PJ Media readers would note, I first identified and termed the ongoing trend of “Known Wolf” terrorism — individuals committing terrorist acts who were already known to law enforcement and national security authorities — back in October 2014.

This year alone, I’ve reported on the following “Known Wolf” incidents: Columbus, Ohio; Orlando, Florida; Normandy, France; Ontario, Canada; Strasbourg, France; Roanoke, Virginia; and New York/New Jersey.

Note that four of the above seven cases in 2016 occurred here in the United States.

Additionally, in September I documented a dozen cases of “Known Wolf” terrorism in the U.S. under the Obama administration:

Here are links to my previous reporting on the “Known Wolf” terror problem: