IG Garhwal range Sanjay Gunjyal said Joshi was arrested from outside a hotel in Patel Nagar area on the basis of an FIR lodged against him and his associates at Nehru Colony police station here in connection with the assault on the horse on March 14.
The Mussoorie MLA was later produced in the court of Additional Chief Judicial Magistrate Vikasnagar Laxman Singh who sent him to 14 days' judicial remand, SSP Sadanad Date said, adding that Joshi has been taken to Suddhowala prison.
Date said Bora along with Joshi was responsible for precipitating the fall of the police horse during the protest march which caused multiple fractures in its left hind leg.
Shaktiman's injured leg had to be amputated by a team of doctors yesterday to save him from infection. He can now stand with the help of a prosthetic leg, the SSP said.
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However, doctors attending on Shaktiman said it will have to be seen whether the prop is strong enough to support the horse which weighs around 400 kgs.
As Shaktiman weighs 400 kgs it is not clear for how long he can stand and move with an artificial leg, he said, adding the horse is under constant watch of doctors and over two dozen police personnel at the police lines.
Meanwhile, Leader of Opposition in the Assembly and state BJPpresident Ajay Bhatt condemned the way Joshi had been arrested.
He also sought Governor K K Paul's intervention into the matter as the MLA had been arrested without taking permission of Uttarakhand Assembly Speaker Govind Singh Kunjwal when the House is in session.