21.   The sources, who asked not to be further identified, said the action was taken after city engineers were unable to repair the pipe with drilling equipment.

22.   Using explosives to implode the building would be the easiest and safest way to do that, said city engineer Paul Brown.

23.   Alunan also recommended that the Quezon City government suspend city engineer Alfredo Macapugay from duty until an investigation is completed, he added.

24.   The city engineer found the building to be structurally sound, but workmen will spend weeks trying to make it fit for habitation.