Happy Raksha Bandhan 2015ANI/Twitter/Collage

Raksha Bandhan, which celebrates the special relationship between brothers and sisters, is being celebrated on 29 August this year.

During the festival, sisters tie a rakhi on their brothers' wrists, while brothers take a life-long vow to protect their sisters.

The hashtag, #happyrakshabandhan, has been trending since Saturday morning. Prime Minister Narendra Modi greeted Indians on the occasion of Raksha Bandhan on 29 August.

Modi also posted photos of children tying rakhi on his wrist:

Below are more pictures of women and children tying rakhi to PM Modi:

President Pranab Mukhejee also wished the nation a "Happy Raksha Bandhan". He urged all Indians to dedicate themselves to the "well-being of women of India particularly the girl child".

Meanwhile, Bihar CM Nitish Kumar Yadav introduced an innovative way to celebrate Raksha Bandhan. He tied rakhi on the trunk of a tree.

"We have started a tradition of tying rakhi to a tree on this auspicious day," ANI quoted the Bihar CM as saying. "The motive behind the start of this tradition is to safe guard and conserve the trees in the same manner as is done by the brothers for their sisters."

Check out the photos below:

Andhra Pradesh Chief Minister Chandra Babu Naidu also celebrated Raksha Bandhan:

Meanwhile, Congress workers in Bhopal protested price hike by gifting onions and pulses to sisters.

Muslim women tied rakhi to Madhya Pradesh CM Shivraj Singh Chauhan in Bhopal:

Delhi CM Arvind Kejriwal's sister Dr Ranjana Gupta tied rakhi to him on Saturday.

Veteran BJP leader LK Advani also celebrated Raksha Bandhan on 29 August.

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