Forces went looking for the tunnels following a tip they received around plans for smugglers to bring a load of bricks into the Gaza Strip.
With a continued ban on the entrance of construction goods for private building projects, materials like bricks and cement are unavailable to the public, restricted to the use of international aid agencies.
Egyptian security said the tunnels were located in the Al-Brazil neighborhood of Egyptian Rafah. They added that the bricks were seized and taken to a warehouse in Egypt." (source)