A newly submitted brief by the US Department of Justice has shed further light on a terrorism case that places Turkey at the center of transit routes used by operatives linked to the so-called Islamic State in Iraq and Syria (ISIS). The latest filing provides more detailed evidence of travel planning, logistical arrangements, and connections to a separate attack plot within the United States.

The document, filed on February 5, 2026, by the US Attorney’s Office for the District of New Jersey, argues against granting pretrial release to Tomas-Kaan Jimenez-Guzel. The defendant—who holds US, Turkish, and Spanish citizenship—was arrested on November 4, 2025, at Newark Liberty International Airport while preparing to board a flight to Turkey. Prosecutors allege that his ultimate destination was ISIS-controlled territory in Syria.

Earlier reporting had already identified Turkey as a central component of the group’s travel strategy. However, the new filing significantly expands on that account, presenting what authorities describe as concrete evidence of operational preparation rather than mere ideological sympathy.

One of the most notable revelations is that Jimenez-Guzel had allegedly arranged onward travel within Turkey. Investigators reportedly discovered a confirmed bus booking on his phone for November 7, 2025, from Istanbul to Gaziantep—a city near the Syrian border that has long been associated with cross-border movement into conflict zones.

Prosecutors also state that he had been in contact with an individual believed to be a smuggler capable of facilitating entry into Syria. In addition, the filing outlines financial and logistical steps taken in coordination with an alleged accomplice, Saed Ali Mirreh, including a $500 transfer to support travel expenses.

Digital evidence forms a significant part of the case. Authorities report recovering images, search queries, and documents detailing routes from Turkey into Syria, along with guidance on evading detection. Among the materials cited is a lengthy document titled “Hijrah to the Islamic State,” which reportedly includes instructions on border crossings, avoiding scrutiny in Turkey, and navigating transit points near the frontier.

Investigators also identified online searches related to border geography, militant activity, and prominent ISIS figures. Prosecutors argue that this pattern reflects sustained preparation rather than casual or exploratory behavior.

Beyond travel logistics, the filing paints a broader picture of alleged radicalization and intent. Authorities say Jimenez-Guzel had drawn attention from investigators as early as October 2024 due to online statements referencing potential attacks in the United States. Subsequent communications in 2025, cited in the filing, include expressions of violent intent toward various targets, which prosecutors argue demonstrate a willingness to act domestically if foreign travel failed.

A particularly significant aspect of the case involves an alleged connection to a separate ISIS-linked plot in Dearborn, Michigan. According to the filing, Jimenez-Guzel visited the area in mid-2025 and met individuals later implicated in that investigation. In later communications, he reportedly discussed the possibility of an attack modeled on incidents in Europe and speculated about potential targets.

Prosecutors further allege that he indicated a fallback plan: if prevented from leaving the United States, he would pursue violent action domestically. The filing also claims he became alarmed after the Michigan arrests were made public, urging associates to accelerate their departure, erase communications, and avoid detection.

Evidence recovered from physical searches adds another layer to the case. Authorities report finding tactical gear, including a holster and vest, at his residence, along with handwritten notes referencing militant concepts and contact information linked to his associates. Prosecutors present these findings as indicators of deliberate preparation.

Mirreh, following his arrest in Washington state, is said to have acknowledged plans to travel abroad with Jimenez-Guzel to join ISIS. Combined with encrypted communications, financial records, and surveillance data, prosecutors argue that the evidence establishes a coordinated effort rather than isolated behavior.

The government has also emphasized the defendant’s international ties, including family connections in Turkey, arguing that these increase both the risk of flight and the potential danger to the public.

During bail proceedings, the defense presented a different narrative, suggesting that Jimenez-Guzel’s behavior was influenced by personal and medical challenges, including head injuries that disrupted his life trajectory and led to isolation. His legal team contended that many of his online statements were exaggerated and did not reflect real operational capability. They proposed strict conditions for release, but the request was denied by US Magistrate Judge José R. Almonte on February 6, who ruled that detention was necessary to ensure public safety.

Additional background provided in the filing outlines Jimenez-Guzel’s family history, including his mother’s Turkish origins and international professional career. While not directly related to the charges, prosecutors included these details to underscore his cross-border connections.

Taken as a whole, the latest Justice Department submission deepens the narrative first outlined in the original complaint. What initially appeared as intent has now been supplemented with evidence of execution: a booked flight to Turkey, planned onward travel to a border city, documented research on crossing into Syria, and reactions to developments in a separate domestic case.

The filing also introduces a more troubling dimension—suggesting that the accused not only sought to join ISIS abroad but may have considered carrying out violence within the United States if those plans were thwarted.

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