A Hong Kong official on Wednesday scotched rumours that the East Rail Line will be extended into Shenzhen, with a "co-location" immigration clearance arrangement put in place.

Media reports earlier this year cited a mainland official as saying such a plan could be on the cards, as the Shenzhen side of the Lo Wu crossing is being redeveloped.

But asked about the reports in Legco, Security Secretary Chris Tang said there is no plan to extend the MTR line into the Luohu district of Shenzhen, or bring in a co-location arrangement like the one in place for high-speed rail passengers at West Kowloon Station.

Tang said the government understands that Shenzhen authorities will soon carry out modification works on their side of the border crossing to "eliminate safety hazards, improve the port's functions, and upgrade the inspection facilities".

Tang said the work to be carried out will not change the overall layout of the facilities and once completed, the time for immigration clearance on the Hong Kong side will not be affected.