A UN-sponsored agreement for the reconstruction of Gaza is facing sharp criticism from senior international officials and NGOs, who say it will create a restrictive new monitoring regime for building materials that risks putting the UN in charge of a continuing Israeli blockade. At the centre of the row is Israel s insistence that basic goods such as cement, bricks and steel reinforcing - which it says have in the past been diverted by Hamas to build infiltration tunnels and bunkers - are 'dual-use' materials with a military application.