The Haifa Magistrate's Court extended the detention of the two German nationals arrested on suspicion of photographing security facilities and security-related activities near Damon Prison by 24 hours on Sunday evening.
Their hearing was held behind closed doors.
The two were arrested on Saturday night after being spotted near the entrance to the facility and photographing it with their cellphones, prompting the dispatch of additional prison officers, who approached the two men and conducted an initial inspection.
An examination of their cellphones revealed the images, raising further suspicions about why they were at the location and why the took the photos.
Following the discovery, the case was handed over to Israel Police, which launched an investigation into the circumstances of the incident.
At this stage, the purpose of the photographs remains unclear, as does whether the incident involved security-related activity or whether the photographs were taken for another reason.
Damon Prison is a security facility where security prisoners and detainees, including female prisoners and minors, are held.
Recently, a special wing was established at the facility for dozens of defendants and detainees involved in espionage cases in recent years.
Police arrest tourist who stated intent to commit terror attack at IDF's Kirya complex
In early October, N12 News reported that an American tourist was arrested outside of the IDF's Kirya complex in Tel Aviv after taking photos of the surroundings and announcing his intention to carry out a terror attack.
He was subsequently arrested and reportedly sent for a psychiatric evaluation.
Israel Police confirmed the arrest in its own statement, though it did not name the security site, nationality, or the reason for the tourist's arrest beyond their "suspicious" behavior at the site.