The lead agency must also coordinate with other agencies and review security plans for infrastructure and utilities that could threaten event security (local water supply, water treatment facilities, electricity supply, communications grid, sewer system, computer systems, etc.). At some special events, manhole covers have been welded shut near the event venues. Often, newspaper dispensers and public trash cans are removed before an event (they can be hiding places for bombs and can be used as missiles to harm law enforcement or destroy property). When such measures.
