Israeli soldiers found a tunnel shaft used by Hamas fighters at Gaza’s Al Shifa hospital, the army said, while the United Nations voiced concern no aid would be delivered to Palestinians on Friday via the Rafah crossing with Egypt, Reuters reports.

The army released a video it said showed a tunnel entrance in an outdoor area of Al Shifa, Gaza’s biggest hospital.

The video, which Reuters could not immediately verify, showed a deep hole in the ground, littered with and surrounded by concrete and wood rubble and sand. It appeared the area had been excavated; a bulldozer appeared in the background.