From the world's highest battle field to Delhi's Rajpath, India in a first of its kind event, observed the International Yoga Day celebrations along with some 191 countries across the world.

Prime Minister Narendra Modi led tens of thousands of people in a yoga session in the centre of the capital on Sunday to showcase the country's signature cultural export, which has prompted criticism of fomenting social divisions at home.The ancient Hindu discipline which has become an estimated $27 billion industry in the United States is being celebrated across the world as an International Yoga Day which Modi pushed for soon after taking power last year.

Rajpath turns into Yogapath, Modi in various asanas

Delhi CM, Lt Governor also reach Yogapath

Red Fort

Varanasi - the spiritual capital of India

Gujarat Chief Minister takes the lead

Sushma Swaraj reaches US to inaugurate Yoga day

At the world's highest battle field, Siachen.

Across foundations and schools

Meanwhile, Yellow Butterfly Yoga, a yoga training organisation also observed Yoga Day celebrations with full enthusiasm in New Delhi.

People chanting 'om' during the session | Source: ScoopWhoop/Sneha Mitra

Yoga artists perform Head Stand to observe the Yoga day in New Delhi | Source: ScoopWhoop/Sneha Mitra

Women perform yoga in the national capital.| Source: ScoopWhoop/Sneha Mitra

Participants performing 'Tadasana' during the International Yoga Day celebrations. | Source: ScoopWhoop/Sneha Mitra

International Yoga Day is also being celebrated in various other parts of the world. In Britain, mats will be rolled out along the banks of the River Thames.