Until 2004, the three jamarāt (singular: jamrah) were tall pillars. After the 2004 Hajj, Saudi authorities replaced the pillars with 26-metre-long (85 ft) walls for safety; many people were accidentally throwing pebbles at people on the other side. To allow easier access to the jamarāt, a single-tiered pedestrian bridge called the Jamaraat Bridge was built around them, allowing pilgrims to throw stones from either ground level or from the bridge.