The tax authorities raided the home and office of a key prosecution witness in a graft case against ex-Penang chief minister Lim Guan Eng, the Kuala Lumpur Sessions Court heard.

Businessperson Zarul Ahmad Zulkifli testified the raid took place in 2017 when the issue of the RM6.3 billion Penang undersea tunnel project was the talk of the public.

The former director of Consortium Zenith Construction Sdn Bhd - awarded the controversial project...