Earlier in the day, Bharatiya Janata Party's Devendra Fadnavis took oath as Maharashtra's Chief Minister for the second consecutive term after BJP pulled off a coup of sorts by forming the government in Maharashtra with the support of NCP's Ajit Pawar.
The oath was administered by Governor Bhagat Singh Koshyari at Raj Bhawan, news agency ANI reported.
Shiv Sena: Shiv Sena has filed a writ petition in the Supreme Court against Devendra Fadnavis and Ajit Pawar taking oath as CM and Deputy CM of Maharashtra respectively. #Maharashtrapic.twitter.com/AoyIwrp48T
Nationalist Congress Party leader Ajit Pawar was sworn in as deputy chief minister of the state.
The move came at a time when deliberations among Congress, NCP and Shiv Sena on the government formation had seemingly reached the final stage on Friday.
The BJP, which emerged as the single-largest party in the last month's assembly elections, could not stake claim to form the government as its ally Shiv Sena remained firm on rotating the Chief Minister's post.
The BJP won 105 seats in the 288-member assembly followed by Shiv Sena 56, NCP 54 and Congress 44.