Tonga’s Prime Minister Siaosi Sovaleni has abruptly quit his post in parliament ahead of a planned confidence vote in his leadership, capping a period of fraught relations between his government and Tonga’s king.

The foreign ministers of Australia and China were both making their final stops Friday on what has become an island-hopping diplomatic duel in the South Pacific.

China’s Foreign Minister Wang Yi arrived in Tonga on Tuesday as he continued his regional island-hopping tour a day after failing to ink an ambitious deal with 10 South Pacific nations.

The third explosion they heard sent everyone on Mango Island running.

The tsunami threat around the Pacific from a huge undersea volcanic eruption has begun to recede, while the extent of damage to Tonga remains unclear.