A 6.4 magnitude quake struck southern Taiwan today, causing panic among residents in the island's second largest city who rushed into the streets as buildings shook. The quake hit about 70 kilometers from the main southern city of Kaohsiung, the US Geological Survey said, and it was felt as far away as the capital Taipei in the north of the island. It is the worst earthquake to hit the Kaohsiung area<br/>since records began, the TVBS news network reported.<br/> <br/>No tsunami warning was immediately issued and the extent of the damage was not immediately clear.