Taipei prosecutors have charged a man over online comments threatening violence against supporters of Taiwan's opposition parties, a sign of how bitter the island's political split has become.

• A man surnamed Chen wrote comments on a TV network's Facebook page urging people to "take out" supporters of the KMT and its ally, saying weapons would be in hand on the day.
• The posts came days before a July 25 rally by the KMT on Ketagalan Boulevard in central Taipei.
• Taipei prosecutors say the comments publicly incited others to commit violence and killing, and charged him with threatening the public, criminal intimidation, and inciting crime in writing.
• The case shows Taiwan's blue-versus-green divide spilling from politics into open threats of street violence.

Outlook: The case now goes to court, and further prosecutions are likely if similar threats surface around future rallies.