An investigation by the city’s Department of Buildings uncovered a tunnel that was 60-foot-long, 8-foot-wide and 5-foot-high located underneath the global headquarters of the Chabad Lubavitch movement, an important Jewish site.

New York building officials have issued emergency work orders to stabilize a historic synagogue and its neighboring structures after an illicit underground tunnel was discovered at the sanctuary earlier this week.

An investigation by the city’s Department of Buildings uncovered a tunnel that was 60-foot-long, 8-foot-wide and 5-foot-high located underneath the global headquarters of the Chabad Lubavitch movement, an important Jewish site. It extends under several buildings in the vicinity.

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The property is a deeply revered site that each year receives thousands of visitors, including international students and religious leaders. Its Gothic Revival facade, immediately recognizable to adherents of the Chabad movement, has inspired dozens of replicas across the world.

Officials and locals said young men in the community recently built the tunnel in secret. When the group’s leaders tried to seal it off Monday, supporters of the tunnel staged a protest that turned violent as police moved in to make arrests.