Taiwan's government has issued security alert after a Chinese satellite flew over its southern airspace ahead of presidential election. In a message, Mobile phone users were advised to be aware for their safety. Taiwan said its defence ministry was tracking the trajectory of the satellite to appropriately alert and respond to the situation. The satellite was at high altitude when it crossed Taiwan's airspace said. Taiwanese media said this is the first time its government has flashed an islandwide alert of this nature. China has long claimed Taiwan as part of its own territory and has been accused of interfering in the vote.<br />