Pope Francis left Indonesia on Friday morning for Papua New Guinea, where the 87-year-old leader of the global Catholic Church will continue an ambitious 12-day tour across Southeast Asia and Oceania.

The Garuda Indonesia plane carrying the pope and his entourage left Jakarta's airport for the flight to Port Moresby, the Papua New Guinean capital, where he will stay for the next three nights.

While in PNG Francis will make a day trip to the northwestern town of Vanimo, before departing the country on Monday. He is then scheduled to visit East Timor and Singapore before returning to Rome on Sept. 13.

In Indonesia, the world's most populous Muslim-majority nation, Francis urged political leaders to guard against religious extremism.

The pope also visited Istiqlal Mosque, Southeast Asia's largest, and signed a joint declaration with the national grand imam. The statement called for "decisive action" by Catholics and Muslims to urge global leaders to confront the dangers of climate change.

The warming planet is expected to remain a focus for the pope's visit in Papua New Guinea, where political leaders have blamed climate change for a spate of natural disasters, including a landslide in March that killed at least 2,000 people.

The pope has stressed the importance of environmental issues throughout his 11-year papacy.

Francis will take part in a brief ceremony on arrival in Port Moresby late Friday afternoon, and then head to the Vatican embassy for the evening. His first public event in the country will be an address to political leaders on Saturday morning.

With Friday's flight, the pope will have travelled about 16,000 km (about 10,000 miles) on the overseas trip, his longest yet. By the time he returns to Rome, he will have clocked nearly 33,000 km (20,500 miles).