BANGKOK (Reuters) -Bombers set off at least 13 blasts in a town in southern Thailand overnight, and police killed two suspected insurgents in a separate raid after a 20-hour siege in a nearby province, authorities said on Saturday. While officials did not link the two incidents directly, the violence came weeks after the government reopened a dialogue with insurgents from a Malay-Muslim minority in the southern part of the Buddhist-majority country. The siege took place in Narathiwat province, where a combined force of soldiers and police surrounded a house in the Ra-ngae district on Friday, f…