Taiwan's coast guard is cracking down on Chinese boats fishing inside its restricted waters, a sign of rising friction in the Taiwan Strait.

• A Chinese trawler was boarded and seized northwest of Xiyu island after ignoring three orders to stop.
• Seven Chinese crew were detained and the boat's catch was dumped back into the sea.
• It is the third Chinese boat seized near Penghu in six days, after two unnamed vessels were caught earlier.
• The crews face penalties under Taiwan's law governing relations with mainland China.

Outlook: More seizures are likely as Chinese boats keep crossing the line and Taiwan keeps patrols heavy around Penghu.