But Yu's claim was rejected by Lee, who claims he asked city council officials to help in an investigation of the matter.
Lee also asked the mayor to set up a cross-departmental task force to clear up all illegally installed cable lines throughout the city.
He said cable line management was ineffective as differing departments were responsible for clearing up only certain cables.
The task could be better accomplished with greater efficiency, Lee said, also adding that disused and illegal cables were on of the city's "chronic problems."
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