Anti-corruption officials in Hong Kong have doubled their investigation team following a significant spike in complaints regarding bid-rigging in building renovation projects.

Hong Kong’s graft buster has received more than 1.5 times as many corruption complaints concerning building renovation in the first four months of this year compared with the same period last year, following heightened public concern over bid-rigging after the deadly Wang Fuk Court fire. In response to the surge in complaints, the Independent Commission Against Corruption (ICAC) said on Tuesday that it had doubled the number of investigators to 100 to handle these cases. But Bernard Charnwut...