Pope Francis concludes Asia trip with final mass in Singapore

Pope Francis leads a holy mass in front of 50,000 people at the National Stadium in Singapore, as he wraps up a 12-day tour through Southeast Asia and Oceania. He held mass and made a plea for migrant workers to be paid fairly in Singapore on Thursday.

There are an estimated 170 million migrant workers around the world. Most live in the Americas or Europe-Central Asia.

Cheap labour has been instrumental in the rapid growth of gleaming metropolises such as Dubai, Doha and Singapore -- the fourth stop on the pope's Asia tour.About 300,000 low-wage migrant workers are estimated to work in Singapore. Many flock from South Asia and from the Philippines, which has a large and devout Catholic majority.